Computerphile

3d X-Ray Images - Computerphile

Wed, 21 Oct 2026 17:59:00 -0000

Robots Automatically loading 3D Xray machines - but why? Professor Tony Pridmore explains how computer science is helping botanists to learn more about plant roots.
EXTRA BITS: http://youtu.be/8TUf8W9GbSs
Why Internet Slows Down When it's Busy: http://youtu.be/TSJw_oQklz8
How Gangnam Style Broke YouTube: http://youtu.be/vA0Rl6Ne5C8
Turing Machines Explained: http://youtu.be/dNRDvLACg5Q

Star Wars 3d Xray: Coming Soon – Subscribe for Updates

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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LogJam Attack - Computerphile

Wed, 21 Oct 2026 13:59:00 -0000

An oldie but a goodie, Dr Mike Pound revisits the Log-Jam attack.

Original Log Jam paper: https://bit.ly/C_LogJamPaper

Thanks to David Domminney Fowler for his help with the woeful framerate of the second camera footage.

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com

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Festive Flashing Lights - Computerphile

Wed, 21 Oct 2026 09:59:00 -0000

How can you make your holiday decorations more interesting? Add computer control! Dr 'Heartbleed' Steve Bagley shows us his setup.

Dr Bagley's code is based on the example here:

http://bit.ly/festivelightcode

Alan Turing & Enigma playlist: http://www.youtube.com/playlist?list=PLzH6n4zXuckodsatCTEuxaygCHizMS0_I
How Psy Broke Youtube: http://youtu.be/vA0Rl6Ne5C8
Why Internet Slows when its Busy: http://youtu.be/TSJw_oQklz8
Storing Data in Memory: Coming Soon, Subscribe for updates

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This video was filmed and edited by Sean Riley.

Thanks to Dr Bagley for additional camera work!

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Discussing PDF@30 Years Old - Computerphile

Wed, 21 Oct 2026 05:59:00 -0000

Professor Brailsford helped Adobe with PDF. His group helped move publishing forwards by publishing a journal about publishing using the actual processes the journal described!

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com

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Why Electronic Voting is a BAD Idea - Computerphile

Wed, 21 Oct 2026 01:59:00 -0000

Voting is centuries old, why can't we move with the times and use our phones, tablets and computers? Tom Scott lays out why e-voting is such a bad idea.

More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Non-Deterministic Automata - Computerphile

Tue, 20 Oct 2026 21:59:00 -0000

Non deterministic finite state automata described and then shown in Python by Professor Thorsten Altenkirch

Here is the code used in the video http://www.cs.nott.ac.uk/~psztxa/computerphile/nfa.py.
And here is my solution to the powerautomaton construction.
http:/wwW.cs.nott.ac.uk/~psztxa/computerphile/nf a-sol.py

#nfa #code #python #Thorsten #automata

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com

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How Gangnam Style Broke YouTube - Computerphile

Tue, 20 Oct 2026 17:59:00 -0000

When YouTube was created, they had no idea that a video might amass over 2 billion views. Dr Steve Bagley explains why Psy's Gangnam Style music video forced YouTube to update their system.
Why YouTube sticks at 301 Views: http://youtu.be/oIkhgagvrjI
Floating Point Numbers: http://youtu.be/PZRI1IfStY0
Kindle Text Problem: http://youtu.be/kzdugwr4Fgk
Crashes & Kernel Panic: http://youtu.be/nr9auoHtvzM

Google Code Style Guide: http://bit.ly/googstylguide

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Ethernet (50th Birthday) - Computerphile

Tue, 20 Oct 2026 13:59:00 -0000

"Ethernet" was named because the inventor believed that the standard could transcend different types of media & 50 yrs on, we still use it! Dr Steve Bagley explains and demos the idea

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com

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Tackling Enigma (Turing's Enigma Problem Part 2) - Computerphile

Tue, 20 Oct 2026 09:59:00 -0000

Just how did the team at Bletchley Park tackle the problem of decoding Enigma? In Part Two of our series on "The Real" Imitation Game, Professor Brailsford explains how they did it.

Part One of this series:
Turing's Enigma Problem: http://youtu.be/d2NWPG2gB_A

Professor Brailsford's notes: http://bit.ly/enigmapart2

Numberphile on Enigma: http://youtu.be/G2_Q9FoD-oQ

History of Undecidability: http://www.youtube.com/playlist?list=PLzH6n4zXuckpIQPv8hiHpJkSyv0fmXEYr
Mainframes and the Unix Revolution: http://youtu.be/-rPPqm44xLs
Turing Machines Explained: http://youtu.be/dNRDvLACg5Q
EXTRA BITS - Banburismus Secret: http://youtu.be/f16iwjntggc

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Four Principles of Quantum (Quantum pt1) - Computerphile

Tue, 20 Oct 2026 05:59:00 -0000

The four underlying principles of Quantum. Part one of a series on Quantum Computing, Victor V. Albert is a Theoretical physicist at University of Maryland and NIST.

Victor V. Albert: @victorvalbert on Twitter

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com

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What Happens When You Click a Link? - Computerphile

Tue, 20 Oct 2026 01:59:00 -0000

Audible free book: http://www.audible.com/computerphile
What happens when you click on a link? Dr Richard Mortier explains the mechanics of connecting you with your favourite website.

Routers, The Internet & YouTube Offline: http://youtu.be/AkxqkoxErRk
Network Stacks and the Internet: http://youtu.be/PG9oKZdFb7w
Crowd-Sourced Sports Coverage: http://youtu.be/5BHw-up-3CA
Floating Point: http://youtu.be/PZRI1IfStY0

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Quantum: Current State 2023 (Quantum pt2) - Computerphile

Mon, 19 Oct 2026 21:59:00 -0000

Continuing our look at the world of quantum, we're looking at the application of quantum technologies, from quantum cryptography to quantum computing. Victor V. Albert is a Theoretical physicist at University of Maryland and NIST.

Victor V. Albert: @victorvalbert on Twitter

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com

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Turing's Enigma Problem (Part 1) - Computerphile

Mon, 19 Oct 2026 17:59:00 -0000

The Enigma cipher machine, said to be unbreakable. Alan Turing had a pivotal role in cracking Enigma codes during WWII. Professor Brailsford takes us through just what Turing and his team were up against.

Engima Part 2: http://youtu.be/kj_7Jc1mS9k

Professor Brailsford's notes: http://bit.ly/enigmapart2

158,962,555,217,826,360,000 – Numberphile: http://youtu.be/G2_Q9FoD-oQ
Flaw in the Enigma Code - Numberphile: http://youtu.be/V4V2bpZlqx8
Punch Card Programming: http://youtu.be/KG2M4ttzBnY
Public Key Cryptography: http://youtu.be/GSIDS_lvRv4

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Power LED Attack - Computerphile

Mon, 19 Oct 2026 13:59:00 -0000

Extracting a secret key by simply watching the flickering of an LED? Sounds implausible but that's what we're discussing with Dr Mike Pound!

Author’s page on the attack:
Video-Based Cryptanalysis (nassiben.com)
Paper: https://bit.ly/C_PowerLED

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com

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Where's the Money in Free Software? - Computerphile

Mon, 19 Oct 2026 09:59:00 -0000

Free as in freedom, not free as in cost, but part of the deal is that the software code is released, so if there's always the ability to get the source code, where's the money in free software? Matt Lee explains.

Free Software: http://youtu.be/jaJ7vUu1ixg
The Kindle Text Problem: http://youtu.be/kzdugwr4Fgk
Floating Point Numbers: http://youtu.be/PZRI1IfStY0

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

Learn more about your ad choices. Visit megaphone.fm/adchoices

Quantum Computing in Reality (Pt3: Beyond the Hype) - Computerphile

Mon, 19 Oct 2026 05:59:00 -0000

What's actually possible vs what's theoretically possible vs what's actually useful with quantum computing? Victor V. Albert of University of Maryland and NIST simplifies!

Victor on Twitter: @victorvalbert

Entire Quantum playlist: https://www.youtube.com/playlist?list=PLzH6n4zXucko55y-YFE4ng1CLiui_3DUr

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com

Learn more about your ad choices. Visit megaphone.fm/adchoices

Why Internet Slows Down When it's Busy - Computerphile

Mon, 19 Oct 2026 01:59:00 -0000

ISPs don't always get it right - they gamble that all of their subscribers won't use all of their bandwidth all of the time. Dr Richard Mortier explains Statistical Multiplexing.

Routing & YouTube Offline: http://youtu.be/AkxqkoxErRk
Network Stacks & The Internet: http://youtu.be/PG9oKZdFb7w
Punch Card Programming: http://youtu.be/KG2M4ttzBnY
Undecidability Series: http://www.youtube.com/playlist?list=PLzH6n4zXuckpIQPv8hiHpJkSyv0fmXEYr

http://www.facebook.com/computerphile
https://twitter.com/computer_phile

This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Mike's Cube Code - Computerphile

Sun, 18 Oct 2026 21:59:00 -0000

Coping with code to constantly count configurations of cubes can cause considerable consternation. Can Computerphile contributor Mike’s concoction continue calculating complete cube configurations or culminate in catastrophe?

Mike's Github link:
https://github.com/mikepound/cubes/

Repository that did this first a few years ago 😊
https://github.com/noelle-crawfish/Enumerating-Polycubes

Wikipedia article:
https://en.wikipedia.org/wiki/Polycube

The page that enumerated up to n=16

Polyominoes Enumeration (kevingong.com)
http://kevingong.com/Polyominoes/Enumeration.html

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com

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EXTRA BITS - Swim Tracking App - Computerphile

Sun, 18 Oct 2026 17:59:00 -0000

More information about the swimming tracking technology featured in our Swim Tracking App video: http://youtu.be/-UxBdVirvJs

More on Joe's swim tracking technology: http://bit.ly/swimmingapp

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Defining Harm for Ai Systems - Computerphile

Sun, 18 Oct 2026 13:59:00 -0000

How do we measure harm to improve the performance of Ai in the real world? Dr Hana Chockler is a Reader in Computer Science at King’s College London.

EXTRA BITS: https://youtu.be/ThGSvYXnMK0

Links from Hana:

title: A Causal Analysis of Harm. authors: Sander Beckers, Hana Chockler, Joe Halpern. conference: NeurIPS'22. link: https://proceedings.neurips.cc//paper_files/paper/2022/hash/100c1f131893d3b4b34bb8db49bef79f-Abstract-Conference.html

title: Quantifying Harm. authors: Sander Beckers, Hana Chockler, Joe Halpern. conference: IJCAI'23. link: https://arxiv.org/abs/2209.15111

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com

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Video Editing with Free Software (Accompanies "Free Software" video) - Computerphile

Sun, 18 Oct 2026 09:59:00 -0000

This is an explanatory video to accompany the last Computerphile entitled 'Free Software' which had a couple of technical problems. This is not a tutorial, nor is it a recommendation, it is the story of Sean trying to make a Computerphile video with GNU free software.

Free Software -made with free software: http://youtu.be/jaJ7vUu1ixg
Free Software -made with proprietary software: http://youtu.be/nXYly_wnAT4
Animated GIFs & Space & Time: http://youtu.be/blSzwPcL5Dw

p.s. The continuity is all over the place as I filmed some of this while in the process of making the last film and some of it after the film was published – watch my beard miraculously grow and be shaved & grow again as the film goes on, see night become day and day become night... Also I'd be interested to see if you're reading this whether you've decoded the binary in the GIMP-created graphics yet? -Sean

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Graphs, Vectors and Machine Learning - Computerphile

Sun, 18 Oct 2026 05:59:00 -0000

There's a lot of talk of image and text AI with large language models and image generators generating media (in both senses of the word) - but what about graphs? Dr David Kohan Marzagao specialises in Machine Learning for Graph-Structured Data and takes us through some simple examples.

mor about David: http://kohan.uk/

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com

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Free Software (made with free software) - Computerphile

Sun, 18 Oct 2026 01:59:00 -0000

Why the Free Software Foundation say iTunes isn't free software. Matt Lee, Technical Lead at Creative Commons explains.

Swim Tracking App: http://youtu.be/-UxBdVirvJs
UTF8 & the Unicode Miracle: http://youtu.be/MijmeoH9LT4
The Kindle Text Problem: http://youtu.be/kzdugwr4Fgk
How this film was made: https://www.youtube.com/watch?v=MS7hXuO2UKE

A version of this film made with Avid (proprietary software): http://youtu.be/nXYly_wnAT4

This film was produced (almost) entirely with free software. The exception is that I transcoded the original footage to an easier to handle format before I started. The project has taken a week & involved me trying no less than five distros, several types of video editing software and spending hours waiting for renders which most of the time failed. I found a way of working which still took five hours to export from the editing software, in pieces, it was then pieced together by mkvmerge and uploaded.

There are some production issues with this film, such as glitchy audio and some harsh cuts, but they are partly down to my inexperience with the specific editing software and lack of patience and not necessarily purely to the software itself.

Thanks for reading this footnote - next step is to pull together a film on how I made this one! Sean

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Turing Machine Alternative (Counter Machines) - Computerphile

Sat, 17 Oct 2026 21:59:00 -0000

Computing with counters. How "counter machines" are as powerful as turing machines, albeit slightly more convoluted! Dr Christopher Hampson, Senior Lecturer in Computer Science Education at KCL explains.

EXTRA BITS: https://youtu.be/ydmV-mWjftc

https://www.facebook.com/computerphile
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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com

Learn more about your ad choices. Visit megaphone.fm/adchoices

Swim Tracking App - Computerphile

Sat, 17 Oct 2026 17:59:00 -0000

Indoor navigation is tricky enough but try doing it in a swimming pool! Joe tells us how he's developed technology that could give you instant feedback on your swimming.
EXTRA BITS: http://youtu.be/dgZvSB5MAIg

More on Joe's swim tracking technology: http://bit.ly/swimmingapp

http://www.facebook.com/computerphile
https://twitter.com/computer_phile

This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

Learn more about your ad choices. Visit megaphone.fm/adchoices

Kernelless Kernel Programming (eBPF) - Computerphile

Sat, 17 Oct 2026 13:59:00 -0000

The tongue-in-cheek title refers to the fact that eBPF can be a shortcut to programming inside the kernel. Dr Richard G Clegg of Queen Mary University London explains how this networking tool has morphed into more.

Richard's notes:

The Github link: https://github.com/richardclegg/ebpf_testing/

A tutorial if you want to find more:
https://play.instruqt.com/embed/isovalent/tracks/ebpf-getting-started?token=em_9nxLzhlV41gb3rKM&show_challenges=true

This is written by an expert but a bit dated now:
https://www.brendangregg.com/blog/2019-01-01/learn-ebpf-tracing.html

libbpf is useful:
https://github.com/libbpf/libbpf

I used code from here by Brendan Gregg in my example:
https://github.com/iovisor/bcc

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com

Learn more about your ad choices. Visit megaphone.fm/adchoices

Technicalities of Net Neutrality - Computerphile

Sat, 17 Oct 2026 09:59:00 -0000

Audible free book: http://www.audible.com/computerphile
What's the technical side of the net neutrality debate? We look at how a it works with a fictitious video streaming site. Dr Richard Mortier has the details.

Routers & Youtube Offline: http://youtu.be/AkxqkoxErRk
Network Stack: http://youtu.be/PG9oKZdFb7w
Pink VR Simulator: http://youtu.be/Lm0lA0enPSk
Undecidability Series: http://www.youtube.com/playlist?list=PLzH6n4zXuckpIQPv8hiHpJkSyv0fmXEYr

http://www.facebook.com/computerphile
https://twitter.com/computer_phile

This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

Learn more about your ad choices. Visit megaphone.fm/adchoices

TETRA Vulnerability (TETRA:BURST) - Computerphile

Sat, 17 Oct 2026 05:59:00 -0000

The 'secure' TETRA communications system has been used by police and security services for decades, it's been revealed that it's seriously flawed. Dr Tim Muller explains.

#tetraburst #security #securitybreach

The team that reverse engineered TETRA and discovered the problems: https://tetraburst.com/

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com

Learn more about your ad choices. Visit megaphone.fm/adchoices

EXTRA BITS - More on Crowd-Sourced Sports Coverage - Computerphile

Sat, 17 Oct 2026 01:59:00 -0000

Extra footage about crowd-sourcing event coverage, including how rights and bandwidth provide additional challenges to the idea.

Put this in context by viewing the main film first: https://www.youtube.com/watch?v=5BHw-up-3CA

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https://twitter.com/computer_phile

This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

Learn more about your ad choices. Visit megaphone.fm/adchoices

CMPRSN (Compression Overview) - Computerphile

Fri, 16 Oct 2026 21:59:00 -0000

Outlining the basics of compression methods, including some of the pitfalls! Dr Steve Bagley demonstrates.

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com

Learn more about your ad choices. Visit megaphone.fm/adchoices

Crowd-Sourced Sports Coverage - Computerphile

Fri, 16 Oct 2026 17:59:00 -0000

Every spectator is a potential camera operator, that's the basis of this research into crowd-sourced event coverage. Dr Martin Flintham explains the idea.

Free Software: Coming Soon, Subscribe for Updates!
Routers, The Internet & YouTube Offline: http://youtu.be/AkxqkoxErRk
Rabbits, Faces & Hyperspaces: http://youtu.be/q6iqI2GIllI
EXTRA BITS: http://youtu.be/43xNdYH-Y3s
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This video was filmed and edited by Sean Riley.

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How Bzip2 Works (Burrows Wheeler Transform) - Computerphile

Fri, 16 Oct 2026 13:59:00 -0000

At the heart of Bzip2 is the Burrows Wheeler Transform. Dr Steve Bagley (and a live studio audience) explains how & why it works.

#compression #ComputerScience

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This video was filmed and edited by Sean Riley.

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Routers, The Internet and YouTube Offline - Computerphile

Fri, 16 Oct 2026 09:59:00 -0000

Routers carry the traffic of the internet, we talk to Dr Richard Mortier about how they work and what happened to YouTube when a government censorship exercise went wrong.

IP Addresses: http://youtu.be/L6bDA5FK6gs
Floating Point Numbers: http://youtu.be/PZRI1IfStY0
The VR Cave: http://youtu.be/STMcWUtQr1Y
Busy Beaver Turing Machines: http://youtu.be/CE8UhcyJS0I

nb: the prefixes that Dr Mortier did in his head should actually have been 128.243.128/24 and 128.243.0/24

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This video was filmed and edited by Sean Riley.

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Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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EXTRA BITS - More on E-Reader Text Layouts - Computerphile

Fri, 16 Oct 2026 01:59:00 -0000

Extra Bits of Brady's interview with Dr Steve Bagley about e-reader text layout problems

The Kindle Text Problem: http://youtu.be/kzdugwr4Fgk

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Oblivious Transfer - Computerphile

Thu, 15 Oct 2026 21:59:00 -0000

Share part of a secret without knowing which part? Dr Tim Muller explains how Oblivious Transfer works.

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Thank you to Jane Street for their support of this channel. Learn more: https://www.janestreet.com

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The Kindle Text Problem - Computerphile

Thu, 15 Oct 2026 17:59:00 -0000

Why is it that PDFs look great and yet e-books can look ropey? - Dr Steve Bagley turns Brady into a computer to find out.

EXTRA BITS: http://youtu.be/CdbvgRqyC-0
Floating Point Numbers: http://youtu.be/PZRI1IfStY0
EXTRA BITS - More on Printing and Typesetting History: https://www.youtube.com/watch?v=HdModNEK_1U
Shellshock Code & the Bash Bug: http://www.youtube.com/watch?v=MyldPMn95kk

nb: the percentage in an e-reader tends to refer to how much book you have left to go, not the state of the battery charge! -Sean

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This video was filmed and edited by Sean Riley.

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Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Binary Search Algorithm - Computerphile

Thu, 15 Oct 2026 13:59:00 -0000

Back to basics as Dr Mike Pound explains a simple but incredibly useful algorithm, binary search.

#algorithm #ComputerScience

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Turing Meets Paradoxes (History of Undecidability Part 3) - Computerphile

Thu, 15 Oct 2026 09:59:00 -0000

Taking a solemn oath to promise never to write a program that analyses other programs? - That's how Professor Brailsford felt when he first understood undecidability.

Latest in our series on the History of Undecidability

Undecidability Tangent (History of Undecidability Part 1): http://youtu.be/nsZsd5qtbo4
Barber & Russell Paradoxes (History of Undecidability Part 2): http://youtu.be/FK3kifY-geM
Turing & the Halting Problem: http://youtu.be/macM_MtS_w4
Busy Beaver Turing Machines: http://youtu.be/CE8UhcyJS0I

Shellshock, The Bashdoor Bug: http://youtu.be/MyldPMn95kk

History of Undecidability (Playlist): http://www.youtube.com/playlist?list=PLzH6n4zXuckpIQPv8hiHpJkSyv0fmXEYr

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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True Random Numbers - Computerphile

Thu, 15 Oct 2026 05:59:00 -0000

Programs aren't capable of generating true random numbers, so how can we? Are they even useful? Dr Valerio Giuffrida demonstrates how to get a true random number from most computers.

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Thank you to Jane Street for their support of this channel. Learn more: https://www.janestreet.com

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Shellshock Code and the Bash Bug - Computerphile

Thu, 15 Oct 2026 01:59:00 -0000

Audible free book: http://www.audible.com/computerphile
Shellshock is potentially a bigger problem than Heartbleed, as Dr Steve Bagley explains.

Heartbleed, Running the Code: http://youtu.be/1dOCHwf8zVQ
Public Key Cryptography: http://youtu.be/GSIDS_lvRv4
Turing & the Halting Problem: http://youtu.be/macM_MtS_w4
Shellshock EXTRA BITS: http://youtu.be/YztlIZNsumw

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Defining Cybersecurity with Gene Spafford - Computerphile

Wed, 14 Oct 2026 21:59:00 -0000

Legendary cyber-security expert Professor Gene Spafford joins us to try to define what cyber-security even is! "Spaf" as he's known, is a faculty member at Purdue University and now Honorary Professor at the University of Nottingham.

Dr Spafford is a Fellow of the American Academy of Arts and Sciences, the Association for the Advancement of Science, the ACM, the IEEE, and the (ISC)2; a Distinguished Fellow of the ISSA; and a member of the Cyber Security Hall of Fame, the only person to ever hold all these distinctions.

The book "Cybersecurity, Myths and Misconceptions" can be found here: https://bit.ly/C_CyberMythsBook

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Thank you to Jane Street for their support of this channel. Learn more: https://www.janestreet.com

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Blogging Guitar - Computerphile

Wed, 14 Oct 2026 17:59:00 -0000

If musical instruments could speak, what stories could they tell? Professor Benford and his team have created an instrument that documents its own life - the Carolan Guitar

Extra Bits – More on the build of the Carolan Guitar: http://youtu.be/ZGLlt2XBro4
The Penguin Barcode: http://youtu.be/kW39Mt5kscQ
Musical Floppy Drives: http://youtu.be/C3dU5u4xXaY

nb thankfully there exists no more footage of me butchering any songs on the guitar - I am really a drummer, not a guitarist! -Sean

For more info on the instrument, visit: http://www.carolanguitar.com

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This video was filmed and edited by Sean Riley.

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Bug in Binary Search - Computerphile

Wed, 14 Oct 2026 13:59:00 -0000

Mike talks through a binary search bug that was undiscovered for years!

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Thank you to Jane Street for their support of this channel. Learn more: https://www.janestreet.com

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Barber and Russell Paradoxes (History of Undecidability Part 2) - Computerphile

Wed, 14 Oct 2026 09:59:00 -0000

$20 off your 1st purchase at www.LittleBits.com use the code “COMPUTERPHILE”
The Barber Paradox: Professor Brailsford continues the history of undecidability.

History of Undecidability Part1: http://youtu.be/nsZsd5qtbo4
Turing & The Halting Problem: http://youtu.be/macM_MtS_w4

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This video was filmed and edited by Sean Riley.

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Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Optimising Code - Computerphile

Wed, 14 Oct 2026 05:59:00 -0000

You can optimise for speed, power consumption or memory use & tiny changes can have a negligible or huge impact, but what should you optimise and most importantly, when? Dr Steve Bagley has an example!

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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A New Perspective (Multi-Person 3D system) - Computerphile

Wed, 14 Oct 2026 01:59:00 -0000

Our thanks to http://www.harrys.com/ use the coupon code "COMPUTERPHILE" for $5 off
3D perspective personalised to multiple viewers of the screen - cutting edge research which Alex explains.

Many thanks to Alexander Kulik from the Bauhaus-Universität Weimar for showing us their six user VR system.

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Defining Regular Expressions (RegEx) - Computerphile

Tue, 13 Oct 2026 21:59:00 -0000

Ahead of an upcoming Python implementation, Professor Thorsten Altenkirch goes through the details and definitions of Regular Expressions.

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Thank you to Jane Street for their support of this channel. Learn more: https://www.janestreet.com

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Piracy, Pictures and Metadata - Computerphile

Tue, 13 Oct 2026 17:59:00 -0000

With images copied via instant screen-grab & websites stripping metadata clean away where does it leave the creators? Professor Derek McAuley talks about the need for a digital exchange.

Public Key Cryptography: http://youtu.be/GSIDS_lvRv4
How Computer Memory Works: http://youtu.be/XETZoRYdtkw
How Broadband ADSL Works: http://youtu.be/uwtGfyna62I
VR Simulator: http://youtu.be/Lm0lA0enPSk

Thanks to the following for permission to use their pictures and music

Hudson Super Six
David Wayman
@gmjhowe

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This video was filmed and edited by Sean Riley.

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Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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NERFs (No, not that kind) - Neural Radiance Fields - Computerphile

Tue, 13 Oct 2026 13:59:00 -0000

Neural Radiance Field - NeRF - Dr Mike Pound and PhD Student Lewis Stuart demonstrate how a series of photos or a piece of video can lead to a 3D model in your computer.

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Undecidability Tangent (History of Undecidability Part 1) - Computerphile

Tue, 13 Oct 2026 09:59:00 -0000

What was the first undecidable problem? Professor Brailsford takes us on a computerphile tangent & gives us his angle on a pre-computer example of undecidability.

Note from Professor Brailsford: a couple of corrections for this film:
1/ "... early 18th Century" for Gauss should be " ... early 19th century"
2/ "... 100 years ago" for Newton should be "... 100 years before Gauss

3/ The Greek word I was struggling with was "Boeotians". I have now taken expert advice which tells me that the "oe" is pronounced "ee" as in "Oedipus". Hence a reasonable approximation to the correct pronunciation is "Bee-oh-shuns"

4/ In my excitement to get the message across I sometimes refer, in the video, to Euclid's 5th axiom being a "proposition". However it is more accurately a "postulate" i.e. something which should be provable from the other axioms/postulates of the Euclidean system. The fact that it can't be thus proved means that the other axioms are insufficiently powerful to prove it -- hence it is "undecidable" within that axiom system."

Riemann Hypothesis – Numberphile: http://youtu.be/d6c6uIyieoo
Fermat's Last Theorem – Numberphile: http://youtu.be/qiNcEguuFSA
Turing & The Halting Problem: http://youtu.be/macM_MtS_w4

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This video was filmed and edited by Sean Riley.

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Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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What Was Your First Computer Game? (Soundcheck Question 2023) - Computerphile

Tue, 13 Oct 2026 05:59:00 -0000

All through 2023 we've been asking Computerphile contributors to tell us about their first brush with computer games. This is the 2023 sound-check compilation!

Links etc: https://docs.google.com/document/d/17VH5BuYun5ApNGmkChMnm4ppkQrw8pLHsu1roODAC24/edit?usp=drivesdk

Playable:

Horace & the Spiders:
Horace & the Spiders (torinak.com)
Horace goes Skiing:
Horace Goes Skiing (torinak.com)
Painter:
Complete BBC Micro Games Archive - Play
The Hobbit:
VICE: C64, press "F12" for the menu. (archive.org)
3D Monster Maze
Play online: 3D Monster Maze (zx81stuff.org.uk)
Tetris (tetris.com):
Play Tetris | Free Online Game | Tetris
Blockout (3D version of tetris)
DOSBox SVN, CPU speed: 3000 cycles, Frameskip 0, Program: BL (retrogames.cz)
Manic Miner:
Manic Miner (DOS) - online game | RetroGames.cz
Chuckie Egg:
DOSBox SVN, CPU speed: 3000 cycles, Frameskip 0, Program: CHEGA (retrogames.cz)
Sonic The Hedgehog:
Play SEGA Master System Sonic The Hedgehog (USA, Europe) Online in your browser - RetroGames.cc
AtticAttack:
Atic Atac (torinak.com)
Doom:
Doom (DOS) - online game | RetroGames.cz
Doom II:
DOSBox SVN, CPU speed: max 100% cycles, Frameskip 0, Program: DOOM2 (retrogames.cz)
Atari Combat:
Combat - Atari 2600 video games, free online game play in your browser. (free80sarcade.com)
Ghosts and Goblins:
VICE: C64, press "F12" for the menu. (archive.org)
Mariokart - snes
Super Mario Kart - Play Game Online (arcadespot.com)
Bounty Bob Strikes Back
Complete BBC Micro Games Archive - Play
Daley Thompson’s Decathlon
Decathlon (torinak.com)

Videos:

Pilot Wings on SNES
(YouTube via NintendoComplete)
Pilotwings (SNES) Playthrough - NintendoComplete - YouTube

Guldcorn on Amiga (Freeware Advertising Game from Denmark)
(YouTube via Abandonware)
https://www.youtube.com/watch?v=c9pFxLdqN4Q

Zelda on SNES
(YT World of Longplays)
https://youtu.be/Z6hjG6MCcZ8?si=MqOW-obBr4kT02tj

Super Mario Bros. Deluxe on Game Boy Color
(YouTube via NintendoComplete)
Super Mario Bros. Deluxe (Game Boy Color) Playthrough - NintendoComplete (youtube.com)

Prince of Persia 3D (1999) - PC
(YouTube via Firstplays HD)
Prince of Persia 3D (1999) - PC Gameplay 4k 2160p / Win 10 (youtube.com)

Pokémon Yellow for Game Boy ᴴᴰ
(YouTube via Nintendo Utopia)
Pokémon Yellow for Game Boy ᴴᴰ Full Playthrough - YouTube

Age of Empires II
(YouTube via SergiuHellDragoonHQ)
Age of Empires 2 Definitive Edition - Gameplay (PC/UHD) (youtube.com)

River Raid
(YouTube via RZX Archive)
River Raid Walkthrough, ZX Spectrum (youtube.com)

Flight Simulator
(YouTube via Smooth Touchdown)
ZX Spectrum Flight Simulation 48K Game - YouTube

SimCity
(YouTube via LGR)
SimCity 30 Years Later: A Retrospective (youtube.com)

SimCity2000
(YouTube via LGR)
SimCity 2000 30 Years Later: An LGR Retrospective (youtube.com)

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Thank you to Jane Street for their support of this channel. Learn more: https://www.janestreet.com

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Rabbits, Faces and Hyperspaces - Computerphile

Tue, 13 Oct 2026 01:59:00 -0000

Hyperspace was hijacked by science fiction, but what is a space? Robert Miles explains with the use of small red rabbits and human faces.

How Broadband ADSL Works: http://youtu.be/uwtGfyna62I
Busy Beaver Turing Machines: http://youtu.be/CE8UhcyJS0I
Public Key Cryptography: http://youtu.be/GSIDS_lvRv4

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This video was filmed and edited by Sean Riley.

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Computerphile is a sister project to Brady Haran's Numberphile.

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Machine Code Explained - Computerphile

Mon, 12 Oct 2026 21:59:00 -0000

Explaining machine code from the ground up! Famous for 'Compiler Explorer,' Matt Godbolt's code has appeared before on Computerphile but this is his debut.

EXTRA BITS: https://youtu.be/9gXeS8BoLmE

Find out more about Matt from his blog: https://bit.ly/C_MGodbolt

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Thank you to Jane Street for their support of this channel. Learn more: https://www.janestreet.com

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How Broadband ADSL Works - Computerphile

Mon, 12 Oct 2026 17:59:00 -0000

How does ADSL work and what are those noises Modems used to make?

Characters, Symbols and the Unicode Miracle: http://youtu.be/MijmeoH9LT4
Floating Point: http://youtu.be/PZRI1IfStY0
Virtual Reality Cave: http://youtu.be/STMcWUtQr1Y
End for Moore's Law?: http://youtu.be/X8v1BB0UaDs

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Python Regular Expressions - Computerphile

Mon, 12 Oct 2026 13:59:00 -0000

Continuing the exploration of Regular Expressions and Automata with Professor Thorsten Altenkirch.

The professor's code: https://bit.ly/C_PythonRegEx

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

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Hill Climbing Algorithm and Artificial Intelligence - Computerphile

Mon, 12 Oct 2026 09:59:00 -0000

Audible free book: http://www.audible.com/computerphile
Artificial Intelligence can be thought of in terms of optimization. Robert Miles explains using the evolution's algorithm.

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This video was filmed and edited by Sean Riley.

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Progress Bars - Computerphile

Mon, 12 Oct 2026 05:59:00 -0000

Progress bars, what are they and how do they work? Dr Valerio Giuffrida explains and goes through an implementation of a progress bar.

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Turing Machine Primer - Computerphile

Mon, 12 Oct 2026 01:59:00 -0000

This Primer is to accompany the 'Busy Beaver Turing Machines' film which can be viewed here: http://youtu.be/CE8UhcyJS0I

Professor Brailsford's code and further reading: http://bit.ly/busybeaver

Turing and the Halting Problem: http://youtu.be/macM_MtS_w4
Busy Beaver Turing Machines: http://youtu.be/CE8UhcyJS0I
Domino Addition – Numberphile: http://youtu.be/lNuPy-r1GuQ
Ackermann Follow Up: http://youtu.be/uNACwX-O5lk

'Turing Machines Collection' Playlist: http://www.youtube.com/playlist?list=PLzH6n4zXuckrEzV0CB1xXbSdsP_a7VUoK

“The Most Difficult Program to Compute?” (Original Ackermann Film): http://youtu.be/i7sm9dzFtEI

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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How CPUs Do Math(s) - Computerphile

Sun, 11 Oct 2026 21:59:00 -0000

Matt Godbolt continues the story of the CPU and explains how machines do addition

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Busy Beaver Turing Machines - Computerphile

Sun, 11 Oct 2026 17:59:00 -0000

The Busy Beaver game, pointless? Or a lesson in the problems of computability? - How do you decide if something can be computed or not?

Professor Brailsford's code and further reading: http://bit.ly/busybeaver

Turing Machine Primer: http://youtu.be/DILF8usqp7M
Busy Beaver Code: http://youtu.be/ZiTeuZSDB0U
Ackermann Follow Up: http://youtu.be/uNACwX-O5lk
Original 'Ackermann' Film (Most Difficult Program to Compute): http://youtu.be/i7sm9dzFtEI

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This video was filmed and edited by Sean Riley.

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Python Hash Sets Explained and Demonstrated - Computerphile

Sun, 11 Oct 2026 13:59:00 -0000

Featuring Mike Pound. Jane Street skyscraper puzzle (and info on the AMP program) at https://bit.ly/computerphile-amp --- More below ↓↓↓

Hash Sets in Python work a little bit like the index of a book, giving you a shortcut to looking for a value in a list. Dr Mike Pound explains how they work and demos with some code.

#Python #HashSet #Code #Computerphile

Jane Street’s Academy of Math and Programming is now accepting applications for their summer 2024 program, which will run from June 29th-August 2nd in NYC... Or you can just check out the puzzle for fun too - https://bit.ly/computerphile-amp (episode sponsor)

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Turing Machines Explained - Computerphile

Sun, 11 Oct 2026 09:59:00 -0000

Turing Machines are the basis of modern computing, but what actually is a Turing Machine? Assistant Professor Mark Jago explains.

Turing & The Halting Problem: http://youtu.be/macM_MtS_w4
Busy Beavers: https://youtu.be/CE8UhcyJS0I
Avatars & In-Flight VR: http://youtu.be/TLKqKlrQv4s
The (pink) VR Simulator: http://youtu.be/Lm0lA0enPSk

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Discussing Digital Twins - Computerphile

Sun, 11 Oct 2026 05:59:00 -0000

Digital Twin - a new buzz word or a useful piece of technology? We asked Dr Steffen Zschaler, Reader in Computer Science at Kings College London.

#ComputerScience #DigitalTwin #CS #computing

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Avatars and In-Flight VR - Computerphile

Sun, 11 Oct 2026 01:59:00 -0000

What are the long term effects of wearing VR head-sets? Can you use VR to shrink your body and have the illusion of more space on board an aircraft?

Thanks to Betty Mohler of Max Planck Institute for Biological Cybernetics for taking the time to explain the research, and to Dr Mirabelle D'Cruz of the University of Nottingham.

Original 'Holodeck' film: http://youtu.be/7ZPs7knvs7M
Pink VR Simulator: http://youtu.be/Lm0lA0enPSk
VR Cave: http://youtu.be/STMcWUtQr1Y
'Invisible' Plane: COMING SOON
What is VR Hyperspace?: http://youtu.be/PJ5LJkpwBAI

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This video was filmed and edited by Sean Riley.

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Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Mechanising (Graphical) Mathematical Proofs - Computerphile

Sat, 10 Oct 2026 21:59:00 -0000

A graphical problem seems intuitive to a human, but how do you explain something formally to a machine? Dr. Mohammad Abdulaziz, Lecturer in Artificial Intelligence, King's College London

This video was initially titled "Mechanizing Mathematical Proofs"

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Turing and The Halting Problem - Computerphile

Sat, 10 Oct 2026 17:59:00 -0000

Alan Turing almost accidentally created the blueprint for the modern day digital computer. Here Mark Jago takes us through The Halting Problem.

Turing Machines Explained: https://youtu.be/dNRDvLACg5Q
Busy Beaver: https://youtu.be/CE8UhcyJS0I
VR Simulator: http://youtu.be/Lm0lA0enPSk
What on Earth is Recursion?: http://youtu.be/Mv9NEXX1VHc

Thanks to Assistant Professor Mark Jago of the University of Nottingham.

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Coding a Web Server in 25 Lines - Computerphile

Sat, 10 Oct 2026 13:59:00 -0000

Just how simple can a web server be? Laurence Tratt, Shopify / Royal Academy of Engineering Research Chair in Language Engineering at Kings College London builds it up.

More about Laurie: https://bit.ly/C_LaurenceTratt

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Thank you to Jane Street for their support of this channel. Learn more: https://www.janestreet.com

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The (pink) VR Simulator - Computerphile

Sat, 10 Oct 2026 09:59:00 -0000

This giant robot arm (usually seen on the factory floor) is being used to research the effects of in flight comfort for the VR Hyperspace project.

Many thanks to Dr Florian Soyka of the Max Planck Institute for Biological Cybernetics for showing us their Cyber Motion Simulator.

Public Key Cryptography: http://youtu.be/GSIDS_lvRv4
How Computer Memory Works: http://youtu.be/XETZoRYdtkw
The Virtual Reality Cave: http://youtu.be/STMcWUtQr1Y
Tweeting Vending Machine: http://youtu.be/-NVex5tVGy8

In Flight Virtual Reality: http://youtu.be/PJ5LJkpwBAI

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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L Systems : Creating Plants from Simple Rules - Computerphile

Sat, 10 Oct 2026 05:59:00 -0000

From simple rules, complex 'organisms' can emerge. PhD candidate Zachariah Garby has been studying the papers to find out what it's all about.

This was formerly called: Digital Plants (L-Systems)

EXTRA BITS: https://youtu.be/oFqbVJm8gw0
Zac's code: https://bit.ly/C_Zac_L-systems

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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EXTRA BITS: The Danger Theory Explained - Computerphile

Sat, 10 Oct 2026 01:59:00 -0000

A practical demonstration of a theory in immunology called "The Danger Theory" that provided the source for the "Dendritic Cell Algorithm" mentioned in our main 'Danger Theory' film: http://youtu.be/urd4uWJ2rH4

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This video was filmed and edited by Sean Riley.

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3D Gaussian Splatting! - Computerphile

Fri, 09 Oct 2026 21:59:00 -0000

A new technique to turn pictures of a scene into a 3D model is quick, easy and doesn't require that much compute power! Dr Mike Pound and PhD student Lewis Stuart demo and explain.

Lewis used this Particle simulation in Unity: GitHub - keijiro/SplatVFX: https://github.com/keijiro/SplatVFX

NeRFStudio is here : https://docs.nerf.studio/index.html

Previous (nerf) video: https://youtu.be/wKsoGiENBHU

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Thank you to Jane Street for their support of this channel. Learn more: https://www.janestreet.com

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The Danger Theory - Computerphile

Fri, 09 Oct 2026 17:59:00 -0000

Artificial Immune Systems are taking on board cutting edge immunology research and creating algorithms that exploit it. Dr Julie Greensmith explains The Danger Theory.

EXTRA BITS - Danger Theory Practical Demo: http://youtu.be/NXqIpU6Gejw

AIS & Negative Selection: http://youtu.be/u2qRUtg2k3Y
Public Key Cryptography: http://youtu.be/GSIDS_lvRv4
Crashes, Cosmic Rays and Kernel Panic: http://youtu.be/nr9auoHtvzM

For more information on the Dendritic Cell Algorithm, visit Dr Greensmith's web page: http://ima.ac.uk/home/greensmith/

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Garbled Circuits - Computerphile

Fri, 09 Oct 2026 13:59:00 -0000

Going hand in hand with Oblivious Transfer is 'Garbled Circuits' - a way of using logic gates to carefully share information. Dr Tim Muller explains.

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Thank you to Jane Street for their support of this channel. Learn more: https://www.janestreet.com

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Internationalis(z)ing Code - Computerphile

Fri, 09 Oct 2026 09:59:00 -0000

Audible free book: http://www.audible.com/computerphile
Catering for a global audience is difficult, Tom takes us through a 'timezones' style explanation of the things you need to keep in mind when internationalising your code.
This video features Tom Scott - more from him at: http://www.youtube.com/enyay & https://twitter.com/tomscott

The Problem with Time & Timezones: http://youtu.be/-5wpm-gesOY

Emoji & the Levitating Businessman: http://youtu.be/tITwM5GDIAI
Heartbleed, Running the Code: http://youtu.be/1dOCHwf8zVQ
Floating Point: http://youtu.be/PZRI1IfStY0
Public Key Cryptography: http://youtu.be/GSIDS_lvRv4

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Wearable Tech Discussed - Computerphile

Fri, 09 Oct 2026 05:59:00 -0000

The field of Human Computer Interaction has been transformed with wearables that are smaller, more powerful and more plentiful. We talked to HCI expert Max Wilson about the use of his, ahem, one ring.

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Thank you to Jane Street for their support of this channel. Learn more: https://www.janestreet.com

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The Future of Desktop Computing? - Computerphile

Fri, 09 Oct 2026 01:59:00 -0000

Tablets are taking over from desktop computing but what if we merge the two? This prototype demonstrates something new, that builds upon something centuries old - working with paper on your desk.

Many thanks to Dr. Matthias Bues of Fraunhofer IAO in Stuttgart for showing us the prototypes.

More on Fraunhofer: http://www.fraunhofer.de

Floating Point Numbers: http://youtu.be/PZRI1IfStY0
The VR Cave: http://youtu.be/STMcWUtQr1Y
Domino Addition – Numberphile: http://youtu.be/lNuPy-r1GuQ
End of Moore's Law?: http://youtu.be/X8v1BB0UaDs

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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AES GCM (Advanced Encryption Standard in Galois Counter Mode) - Computerphile

Thu, 08 Oct 2026 21:59:00 -0000

Your browser is using this system right now! (at time of typing!) - Dr Mike Pound explains this ubiquitous system!

EXTRA BITS with some of the mathematics: https://youtu.be/7OZyHzYFSgI

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Thank you to Jane Street for their support of this channel. Learn more: https://www.janestreet.com

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Public Key Cryptography - Computerphile

Thu, 08 Oct 2026 17:59:00 -0000

Spies used to meet in the park to exchange code words, now things have moved on - Robert Miles explains the principle of Public/Private Key Cryptography

note1: Yes, it should have been 'Obi Wan' not 'Obi One' :)
note2: The string of 'garbage' text in the two examples should have been different to illustrate more clearly that there are two different systems in use.

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This video was filmed and edited by Sean Riley.

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Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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ChatGPT Jailbreak - Computerphile

Thu, 08 Oct 2026 13:59:00 -0000

With Large Language Models becoming used across all areas of computing, security researcher Dr Tim Muller explores how they can be used for all kinds of unintended purposes.

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Thank you to Jane Street for their support of this channel. Learn more: https://www.janestreet.com

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Real Life Holodeck with an Oculus Rift - Computerphile

Thu, 08 Oct 2026 09:59:00 -0000

The closest thing to Star Trek's 'Holodeck' - a large scale tracking lab with VR headsets used to develop everything from redirected walking to quadcopter control algorithms.

Thanks to Joachim Tesch and Max Planck Institute for Biological Cybernetics for showing us and explaining it.

Emoji & the Levitating Businessman: http://youtu.be/tITwM5GDIAI
Difficult Program to Compute: http://youtu.be/i7sm9dzFtEI
Tweeting Vending Machine Hack: http://youtu.be/-NVex5tVGy8
How Computer Memory Works: http://youtu.be/XETZoRYdtkw

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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CPU Pipeline - Computerphile

Thu, 08 Oct 2026 05:59:00 -0000

How do CPUs make the most efficient use of their compute time? Matt Godbolt takes us through the pipeline - allowing the CPU to do work as many ticks of the system clock as possible!

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Thank you to Jane Street for their support of this channel. Learn more: https://www.janestreet.com

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Artificial Immune Systems - Computerphile

Thu, 08 Oct 2026 01:59:00 -0000

Borrowing from biology and implementing in binary, AIS closely follows immunology and uses it in many areas, including system security. Dr. Julie Greensmith of the University of Nottingham introduces the subject.

Crashes, Cosmic Rays and Kernel Panic:
http://youtu.be/nr9auoHtvzM
Emoji & The Levitating Businessman: http://youtu.be/tITwM5GDIAI
Danger Theory: Coming Soon
VR Hyperspace Simulator: Coming Soon

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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How AI 'Understands' Images (CLIP) - Computerphile

Wed, 07 Oct 2026 21:59:00 -0000

With the explosion of AI image generators, AI images are everywhere, but how do they 'know' how to turn text strings into plausible images? Dr Mike Pound expands on his explanation of Diffusion models.

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Thank you to Jane Street for their support of this channel. Learn more: https://www.janestreet.com

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Emoji and the Levitating Businessman - Computerphile

Wed, 07 Oct 2026 17:59:00 -0000

Audible free book: http://www.audible.com/computerphile
Unicode is changing, adding tons more icons and smilies - But what's new and why? Tom Scott takes us through the improvements...

More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott

Characters, Symbols & the Unicode Miracle: http://youtu.be/MijmeoH9LT4
Floating Point Numbers: http://youtu.be/PZRI1IfStY0
The VR CAVE: http://youtu.be/STMcWUtQr1Y
End for Moore's Law?: http://youtu.be/X8v1BB0UaDs

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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How Branch Prediction Works in CPUs - Computerphile

Wed, 07 Oct 2026 13:59:00 -0000

How does branch prediction speed up operations? Matt Godbolt continues the deep dive into the inner workings of the CPU

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Thank you to Jane Street for their support of this channel. Learn more: https://www.janestreet.com

Learn more about your ad choices. Visit megaphone.fm/adchoices

The Virtual Reality Cave - Computerphile

Wed, 07 Oct 2026 09:59:00 -0000

The Oculus Rift isn't the only way to experience Virtual Reality - A VR CAVE uses large screens and projectors to transform your environment.

Many thanks to Matthias Aust from Fraunhofer IAO for showing us their CAVE

In Flight Virtual Reality: http://youtu.be/PJ5LJkpwBAI
The Most Difficult Program to Compute: http://youtu.be/i7sm9dzFtEI
How Computer Memory Works: http://youtu.be/XETZoRYdtkw

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Has Generative AI Already Peaked? - Computerphile

Wed, 07 Oct 2026 05:59:00 -0000

Bug Byte puzzle here - https://bit.ly/4bnlcb9 - and apply to Jane Street programs here - https://bit.ly/3JdtFBZ (episode sponsor). More info in full description below ↓↓↓

A new paper suggests diminishing returns from larger and larger generative AI models. Dr Mike Pound discusses.

The Paper (No "Zero-Shot" Without Exponential Data): https://arxiv.org/abs/2404.04125

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Thank you to Jane Street for their support of this channel. Learn more: https://www.janestreet.com

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The Most Difficult Program to Compute? - Computerphile

Wed, 07 Oct 2026 01:59:00 -0000

The story of recursion continues as Professor Brailsford explains one of the most difficult programs to compute: Ackermann's function.

Professor Brailsford's programs: http://bit.ly/1nhKtW4

Follow Up Film from the Prof in response to this film: https://www.youtube.com/watch?v=uNACwX-O5lk

What on Earth is Recursion?: http://youtu.be/Mv9NEXX1VHc
Fibonacci Programming: http://youtu.be/7t_pTlH9HwA
Heartbleed, Running the Code: http://youtu.be/1dOCHwf8zVQ
VR Series: COMING SOON!

Please note, Ackermann is spelled incorrectly with one "n" on the title plate - Apologies

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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How Ray Tracing Works - Computerphile

Tue, 06 Oct 2026 21:59:00 -0000

Ray tracing is massive and gives realistic graphics in games & movies but how does it work? Lewis Stuart explains.

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Thank you to Jane Street for their support of this channel. Learn more: https://www.janestreet.com

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In Flight Virtual Reality - Computerphile

Tue, 06 Oct 2026 17:59:00 -0000

Can Virtual Reality be used on aircraft to improve in-flight comfort? The VR Hyperspace project has been exploring that idea and ahead of a series of Computerphile films on VR, Dr Mirabelle D'Cruz introduces the idea.

VR Hyperspace Simulator: Coming Soon
VR Avatars and your 'self': Coming Soon
VR without head mounted displays: Coming Soon
VR & The 'invisible' Plane: Coming Soon

More about the VR Hyperspace project: http://bit.ly/vrhyp

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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How CPUs do Out Of Order Operations - Computerphile

Tue, 06 Oct 2026 13:59:00 -0000

How CPUs that are capable can manage to complete tasks simultaneously without the program knowing. Matt Godbolt continues his series on how processors work.

Many thanks to Space Potatoes for kind permission to use their music: https://2020rendezvous.com/

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Thank you to Jane Street for their support of this channel. Learn more: https://www.janestreet.com

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How Computer Memory Works - Computerphile

Tue, 06 Oct 2026 09:59:00 -0000

How do logic gates store information? - We explore how computer memory works with Dr. Steve "Heartbleed" Bagley

Domino Addition -- Numberphile: http://youtu.be/lNuPy-r1GuQ
YouTube's Secret Algorithm: http://youtu.be/BsCeNCVb-d8
Opening up the 30yr old Mac: http://youtu.be/wFJrHuSXnZM

http://www.facebook.com/computerphile
https://twitter.com/computer_phile

This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

Learn more about your ad choices. Visit megaphone.fm/adchoices

Crowdstruck (Windows Outage) - Computerphile

Tue, 06 Oct 2026 05:59:00 -0000

Nearly nine million Windows machines were taken out by the Crowdstrike problem in July 2024, but why was the impact so problematic? Dr Steve Bagley and Dr Mike Pound of the University of Nottingham discuss the problem.

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This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Thank you to Jane Street for their support of this channel. Learn more: https://www.janestreet.com

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Fibonacci Programming - Computerphile

Tue, 06 Oct 2026 01:59:00 -0000

Audible Free Book: http://www.audible.com/computerphile
Following on from our film on recursion, Professor Brailsford uses the Fibonacci Sequence as a further demonstration of recursive programming.

Original Recursion film: http://youtu.be/Mv9NEXX1VHc
Fibononacci on Numberphile
Sunflowers and Fibonacci: http://youtu.be/DRjFV_DETKQ
Tartan and Bagpipes: http://youtu.be/e4sF_Z5oJek
Fibonacci Mystery: http://youtu.be/Nu-lW-Ifyec

Professor Brailsford's programs and a hint of what is to come: http://bit.ly/1nhKtW4

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

Learn more about your ad choices. Visit megaphone.fm/adchoices

A Helping Hand for LLMs (Retrieval Augmented Generation) - Computerphile

Mon, 05 Oct 2026 21:59:00 -0000

More about Jane Street internships at: https://jane-st.co/internship-computerphile (episode sponsor)
Mike Pound discusses how Retrieval Augmented Generation can improve the performance of Large Language Models.

Mike is based at the University of Nottingham's School of Computer Science.

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Thank you to Jane Street for their support of this channel. Learn more: https://www.janestreet.com

Learn more about your ad choices. Visit megaphone.fm/adchoices

Crashes, Cosmic Rays and Kernel Panic - Computerphile

Mon, 05 Oct 2026 17:59:00 -0000

How or why would a computer ever panic? - What actually happens when things go wrong? Our own 'Dr Heartbleed' Steve Bagley with what happens when a computer crashes.

Heartbleed, Running the Code: http://youtu.be/1dOCHwf8zVQ
Problems with Zero -- Numberphile: http://youtu.be/BRRolKTlF6Q
Fibonacci Programming: Coming Soon, Subscribe for Updates!
How Cell Phones Reveal your Location: http://youtu.be/1U7ROVno2ys

http://www.facebook.com/computerphile
https://twitter.com/computer_phile

This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

Learn more about your ad choices. Visit megaphone.fm/adchoices

Nobel Prize in Physics (and Computer Science?) - Computerphile

Mon, 05 Oct 2026 13:59:00 -0000

The 2024 Nobel Prize in Physics is awarded to John Hopfield and Geoffrey Hinton “for foundational discoveries and inventions that enable machine learning with artificial neural networks”. This video features Juan Garrahan, Phil Moriarty and Mike Pound... More links and info below ↓ ↓ ↓

Nobel Prize press release - https://www.nobelprize.org/prizes/physics/2024/press-release/

Phil Moriarty blog (and vintage rant) on the prize - https://muircheartblog.wpcomstaging.com/2024/10/18/when-is-a-physicist-not-a-physicist/

More Physics Nobel Prize videos - https://www.youtube.com/playlist?list=PLcUY9vudNKBNRA7qR5KbgdY1c5IWIJcqf
Chemistry Nobel Prize videos - https://www.youtube.com/playlist?list=PL9eEsN9D48mddEnxhyfM44MCw4F3PohOI
The 2024 Nobel Prize in Chemistry (also AI related) - https://youtu.be/KMfgV2QSlns

Sixty Symbols (physics channel) - https://www.youtube.com/sixtysymbols

How AI Image Generators Work - https://youtu.be/1CIpzeNxIhU

Juan Garrahan - https://www.nottingham.ac.uk/physics/people/juan.garrahan
Phil Moriarty - https://muircheartblog.wordpress.com
Mike Pound - https://www.nottingham.ac.uk/computerscience/people/michael.pound

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Fuzzy Logic - Computerphile

Mon, 05 Oct 2026 09:59:00 -0000

Real life isn't as simple as true or false - Fuzzy logic allows you to have degrees of truth, meaning computer programmes can deal with more diverse situations.

Home Made Z80 Retro Computer: http://youtu.be/OtpaY8VD52g
Kernel Panic: Coming Soon!

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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The "Goodbye" Problem - Computerphile

Mon, 05 Oct 2026 05:59:00 -0000

You say "bye" first! - no, you say "bye" first! - how do you know when to close the connection? Dr Richard G. Clegg of Queen Mary University London talks us through this frustrating network problem.

nb As some eagle-eyed commenters have spotted, Richard meant to say FIN FIN/ACK ACK for the shut down sequence.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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How Cell Phones Reveal Your Location - Computerphile

Mon, 05 Oct 2026 01:59:00 -0000

Many of us use Location Services & GPS on smartphones but Cell Phone Companies have been able to track us for a long time. Professor Derek McAuley explains.

Blindly Accepting Terms & Conditions
http://youtu.be/9Hb2oMlRI0I

Security of Data on Disk
http://youtu.be/4SSSMi4X_mA

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Recursive Ray Tracing - Computerphile

Sun, 04 Oct 2026 21:59:00 -0000

Ray Tracing seems straightforward, but what about reflections and refractions? Lewis Stuart explains how these are managed by a spot of recursion!

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Coding by SMS text message - Computerphile

Sun, 04 Oct 2026 17:59:00 -0000

What's the most ridiculous activity to do via text message? Joe decided on computer programming & entered a hackathon with a 'text by code' system last year... (he didn't win, maybe its not that ridiculous?)

Tweeting Vending Machine: http://youtu.be/-NVex5tVGy8
Raspberry Pi Hardware: http://youtu.be/sx2HjuZBuo0

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Malleable Encryption - Computerphile

Sun, 04 Oct 2026 13:59:00 -0000

Malleable encryption means you can flip a bit in the encrypted message and the corresponding bit is flipped in the unencrypted plain text. Dr Tim Muller gives us some examples.

nb This video is a reupload due to an audio problem with the first version. For those interested there were tones at approx 2.1k and then at approx 5.5k & 9k - guessing computer fan noise as there were a couple of occasions where it changed frequency slightly possibly as it sped up or slowed down.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Reverse Polish Grows on Trees - Computerphile

Sun, 04 Oct 2026 09:59:00 -0000

Why use Reverse Polish Notation? How does it relate to trees in Computer Science? Professor Brailsford explains how RPN arises naturally, as a linearized form of a tree.

For further research, the Prof suggests you seek out material on the topics of "Postorder Tree Traversal" and "Dijkstra's Shunting Yard"

Correction: In the graphic at 06:30, on the illustration of the second tree, the A is incorrectly labelled as a C.

Reverse Polish Notation & the Stack: http://youtu.be/7ha78yWRDlE
The Dawn of Desktop Publishing: http://youtu.be/1rCNnMZrFUQ
Upside Down Trees: http://youtu.be/umTbivyJoiI
Domino Addition - Numberphile: http://youtu.be/lNuPy-r1GuQ

http://www.facebook.com/computerphile
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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Modern CPUs Assign Registers To Speed Up Your Code - Computerphile

Sun, 04 Oct 2026 05:59:00 -0000

Modern CPUs manage to speed up even the simplest code, Matt Godbolt explains how there's a lot of juggling going on even in the simple use of registers.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Just How do Macs and PCs Differ? - Computerphile

Sun, 04 Oct 2026 01:59:00 -0000

Following on from our contentious 'Mac or PC' film, we asked Professor Tom Rodden just what the actual difference is between Mac and PC. (by PC we are referring to machines running Windows or a variant of Linux)

Floating Point Numbers: http://youtu.be/PZRI1IfStY0
Mac or PC? : http://youtu.be/A_Zptl34hbo
Heartbleed, Running the Code: http://youtu.be/1dOCHwf8zVQ

http://www.facebook.com/computerphile
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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

Learn more about your ad choices. Visit megaphone.fm/adchoices

Creating Your Own Programming Language - Computerphile

Sat, 03 Oct 2026 21:59:00 -0000

What's in a language? Dr Laurie Tratt breaks it down by creating a brand new programming language by writing an interpreter in a few lines of code.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

More from Laurie: https://tratt.net/laurie/

Dr Laurence Tratt is programmer and the Shopify / Royal Academy of Engineering Research Chair in Language Engineering in the Department of Informatics at King’s College London

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Mac or PC? - Computerphile

Sat, 03 Oct 2026 17:59:00 -0000

Over Computerphile's first year, we asked each contributor the question: "Mac or PC?" as part of our sound-check. Here are the answers...

nb - we know that PC is defined as Personal Computer, and that to be pedantic, a Mac 'is' a PC, but in general, 'PC' is the way people refer to a machine running Linux or Windows.

Differences between Macs and PCs: http://youtu.be/SZXY5990xZs
How NOT to Store Passwords!: http://youtu.be/8ZtInClXe1Q
Elegant Compression in Text (LZ): http://youtu.be/goOa3DGezUA
Typesetters in the '80's: http://youtu.be/XvwNKpDUkiE
Little Mac with the Big Bite: http://youtu.be/NMlbUCAOEXw

In Order of Appearance:

Dr Steven Bagley - University of Nottingham
John Chapman - Graphics Programmer
Professor Steve Benford - University of Nottingham
Spencer Owen - Nottingham Hackspace
Professor Derek McAuley - University of Nottingham
Paula Besson - Nottingham University Hacking Society
Matt Lloyd - Ciseco, Nottingham
Michael Erskine - Nottingham Hackspace
Dr. Taha Osman - Nottingham Trent University
James Hayward - Nottingham Hackspace
Professor Tom Rodden - University of Nottingham
Ian Livingstone - Life President of Eidos
Laurence Day - University of Nottingham
Tom Scott - @tomscott
Dr. Richard Mortier - University of Nottingham
Professor Luciano Floridi - Professor of Philosophy and Ethics of Information, Oxford Internet Institute
Alex Pinkney - University of Nottingham
Joe Nash - University of Nottingham
Professor David Brailsford - University of Nottingham
Professor David Brown - Nottingham Trent University
Dr. Thorsten Altenkirch - University of Nottingham

http://www.facebook.com/computerphile
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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

Learn more about your ad choices. Visit megaphone.fm/adchoices

Using Bayesian Approaches and Sausage Plots to Improve Machine Learning - Computerphile

Sat, 03 Oct 2026 13:59:00 -0000

Bayesian logic is already helping to improve Machine Learning results using statistical models. Professor Mike Osborne drew us some sausage plots to explain the idea.

Mike Osborne is Professor of Machine Learning at the University of Oxford - Find out more here: http://www.robots.ox.ac.uk/~mosb?

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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What on Earth is Recursion? - Computerphile

Sat, 03 Oct 2026 09:59:00 -0000

Audible Free Book: http://www.audible.com/computerphile
Recursion; like something from the film "Inception". Even Professor Brailsford says it can be hard to get your head around - watch him make it much easier to understand...

EXTRA BITS: http://youtu.be/0pncNKHj-Sc
Opening up the Original Mac: http://youtu.be/wFJrHuSXnZM

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Software Engineering for Quantum Computing - Computerphile

Sat, 03 Oct 2026 05:59:00 -0000

As quantum devices become more accessible, there's a whole area of software engineering opening up. Mohammad Mousavi specialises in software engineering for quantum computing.

Mohammad Reza Mousavi is a professor of Software Engineering at King's College London & one of the centre directors at King’s Quantum.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Opening up the 30yr old Mac - Computerphile

Sat, 03 Oct 2026 01:59:00 -0000

Opening up the impenetrable Mac - Just what is inside this 30 year old Macintosh? Dr Steve Bagley opens it up in order to upgrade it and show us how it works.

The Little Mac with the Big Bite: http://youtu.be/NMlbUCAOEXw
Is it the End for Moore's Law?: http://youtu.be/X8v1BB0UaDs
Home Made Z80 Computer: http://youtu.be/OtpaY8VD52g

http://www.facebook.com/computerphile
https://twitter.com/computer_phile

This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

Learn more about your ad choices. Visit megaphone.fm/adchoices

How Path Tracing Makes Computer Graphics Look Awesome - Computerphile

Fri, 02 Oct 2026 21:59:00 -0000

Path Tracing takes into account all sorts of indirect light sources to make graphics look real. Building on the previous videos on Ray Tracing, Lewis Stuart demonstrates how Path tracing samples indirect light to create these super scenes.
#graphics #computerscience #pathtracing

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Privacy in Social Media - Computerphile

Fri, 02 Oct 2026 17:59:00 -0000

Who cares about privacy? - Professor Derek McAuley chats about the various problems with privacy online.

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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XZ Exploit - Computerphile

Fri, 02 Oct 2026 13:59:00 -0000

The XZ Exploit was an incredible near miss. Dr Richard G Clegg of Queen Mary University London explains how a seemingly helpful contributor hid some code in part of a ubiquitous piece of software.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Learn more about your ad choices. Visit megaphone.fm/adchoices

YouTube Search and Discovery - Computerphile

Fri, 02 Oct 2026 09:59:00 -0000

How do YouTube decide which videos to recommend? - Cristos Goodrow from YouTube's Search & Discovery chats to Brady.

YouTube's Secret Algorithm: http://youtu.be/BsCeNCVb-d8
YouTube - 301 Views - Numberphile: http://youtu.be/oIkhgagvrjI

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This video by Brady Haran & Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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What's Your Least Favourite Programming Language? (2024 soundcheck question) - Computerphile

Fri, 02 Oct 2026 05:59:00 -0000

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Learn more about your ad choices. Visit megaphone.fm/adchoices

YouTube's Secret Algorithm - Computerphile

Fri, 02 Oct 2026 01:59:00 -0000

YouTube's algorithm connects you with videos you might like. What signals do they use to decide if a video will appeal? More from this interview soon.
Why the view counter freezes at 301: http://youtu.be/oIkhgagvrjI

Featuring Cristos Goodrow from YouTube.

Heartbleed, Running the Code: http://youtu.be/1dOCHwf8zVQ

http://www.facebook.com/computerphile
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This video by Brady Haran & Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile.

See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Computer Timescales Mapped onto Human Timescales - Computerphile

Thu, 01 Oct 2026 21:59:00 -0000

Delving into the various timescales I hereby your computer, and comparing it to an extremely slow human! Matt Godbolt takes us through computer time v human time! (All timings are approximate!)

Many thanks to Space Potatoes for kind permission to use their music: https://2020rendezvous.com/

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Learn more about your ad choices. Visit megaphone.fm/adchoices

Heartbleed, Running the Code - Computerphile

Thu, 01 Oct 2026 17:59:00 -0000

We look at and run the code that exploits the Heartbleed bug. Dr. Steven Bagley takes us through the code and shows us how it works.

Relevant RFC Document: http://bit.ly/heartbleed-rfc

Domino Addition: http://youtu.be/lNuPy-r1GuQ
YouTube's Secret Algorithm: http://youtu.be/BsCeNCVb-d8

http://www.facebook.com/computerphile
https://twitter.com/computer_phile

This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

Learn more about your ad choices. Visit megaphone.fm/adchoices

Solve Markov Decision Processes with the Value Iteration Algorithm - Computerphile

Thu, 01 Oct 2026 13:59:00 -0000

Returning to the Markov Decision Process, this time with a solution. Nick Hawes of the ORI takes us through the algorithm, strap in for an epic episode!

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Is it the End for Moore's Law? - Computerphile

Thu, 01 Oct 2026 09:59:00 -0000

Moore's Law has held true for 40 years, but many say it will soon end - Can chip designers avoid the laws of physics? Professor Derek McAuley explains how chips are built.

Domino Addition - Numberphile : http://youtu.be/lNuPy-r1GuQ
EXTRA BITS: http://youtu.be/mq6eWV5C-YE

http://www.facebook.com/computerphile
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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

Learn more about your ad choices. Visit megaphone.fm/adchoices

Quicksort Algorithm in Five Lines of Code! - Computerphile

Thu, 01 Oct 2026 05:59:00 -0000

Quicksort is a well known algorithm for sorting, Professor Graham Hutton shows how it works and then how to implement it in just five lines of code!

EXTRA BITS: https://youtu.be/7cEaRVEz__I

Professor Hutton is based at the University of Nottingham: https://people.cs.nott.ac.uk/pszgmh/

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Programming in PostScript - Computerphile

Thu, 01 Oct 2026 01:59:00 -0000

Audible free book: http://www.audible.com/computerphile
PostScript is more than just a 2D graphics language, it's a fully operational programming language - Professor Brailsford explains how it works.

Reverse Polish Notation and the Stack: http://youtu.be/7ha78yWRDlE

At 7min 15seconds the Professor refers to for as being the 'operand' when he meant the 'operator'.

The Professor's PS Program: http://bit.ly/postscriptprog

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

Learn more about your ad choices. Visit megaphone.fm/adchoices

DeepSeek is a Game Changer for AI - Computerphile

Wed, 30 Sep 2026 21:59:00 -0000

An AI model that changed the fortunes of silicon valley overnight. Deep Seek has been released open source, and requires far less hardware and investment. Mike Pound is based at the University of Nottingham.

EXTRA BITS: https://youtu.be/tMm7DYTGJ44

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

The Deep Seek papers:
https://github.com/deepseek-ai/DeepSeek-V3/blob/main/DeepSeek_V3.pdf
https://github.com/deepseek-ai/DeepSeek-R1/blob/main/DeepSeek_R1.pdf

https://www.deepseek.com/

This video was filmed and edited by Sean Riley.

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The Tweeting Vending Machine Hack - Computerphile

Wed, 30 Sep 2026 17:59:00 -0000

The vending machine that Tweets when you buy a Twix - Nottingham Hackspace members have improved this eBay purchase with an Arduino... James explains just what it does and why.

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Thanks to Nottingham Hackspace: http://bit.ly/notthack

This video was filmed and edited by Sean Riley.

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How CPU Memory and Caches Work - Computerphile

Wed, 30 Sep 2026 13:59:00 -0000

Relatively speedy-to-access cache saves your computer having to trudge over to the RAM, but with multiple levels of cache memory, how does it all work?

Matt Godbolt is known as the creator of Compiler Explorer, among other things! Find out more about him here: https://xania.org/MattGodbolt

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

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Animated GIFs and Space vs Time - Computerphile

Wed, 30 Sep 2026 09:59:00 -0000

Whether its the Darwin Award nominees or simply another crazy cat, animated GIFs have a lot to answer for. They're also a perfect example of one of Computer Science's fundamental principles - Tom Scott explains.

More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott

How NOT to Store Passwords: http://youtu.be/8ZtInClXe1Q
LZ Text Compression: http://youtu.be/goOa3DGezUA

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Finding The Slope Algorithm (Forward Mode Automatic Differentiation) - Computerphile

Wed, 30 Sep 2026 05:59:00 -0000

The algorithm for differentiation relies on some pretty obscure mathematics, but it works! Mark Williams demonstrates Forward Mode Automatic Differentiation.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

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Should Everybody Learn to Code? - Computerphile

Wed, 30 Sep 2026 01:59:00 -0000

With Code.org in the US and the Next Gen report in the UK, there's currently a real push to include Computer Science in schools, but should everybody learn to code? Professor Tom Rodden talks to Brady

Next Gen Report: http://bit.ly/nextgencode
Code Org: http://bit.ly/codedotorg

Floating Point Numbers - http://youtu.be/PZRI1IfStY0
Error Correction - http://youtu.be/5sskbSvha9M

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No Regrets - What Happens to AI Beyond Generative? - Computerphile

Tue, 29 Sep 2026 21:59:00 -0000

Discussing ideas of what happens after Generative AI plateaus, Dr Jakob Foerster is based at the University of Oxford.

Try the FLAIR simulator here: https://kinetix-env.github.io/gallery.html?editor=true
Papers: https://arxiv.org/pdf/2410.23208 https://arxiv.org/abs/2308.13289

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

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Home-Made Z80 Retro Computer - Computerphile

Tue, 29 Sep 2026 17:59:00 -0000

What better way to understand how a computer works than to build one from components. Spencer built a Z80 based machine from scratch at Nottingham Hackspace.

Grant Searle's Z80 Webpage: http://bit.ly/z80computer
Nottingham Hackspace: http://bit.ly/notthack

A Career in Video Games: http://youtu.be/Q9igeV_YV-s
The little Mac with the Big Bite: http://youtu.be/NMlbUCAOEXw

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This video was filmed and edited by Sean Riley.

With thanks to Nottinghack, the Nottingham Hackspace.

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Generative AI's Greatest Flaw - Computerphile

Tue, 29 Sep 2026 13:59:00 -0000

Described as GenAIs greatest flaw, indirect prompt injection is a big problem, Mike Pound from University of Nottingham explains how it is like SQL Injection, except not...

This video was initially accidentally listed with the beginning missing - apologies! -Sean

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Reverse Polish Notation and The Stack - Computerphile

Tue, 29 Sep 2026 09:59:00 -0000

Reverse Polish, or Postfix notation is commonly used in Computer Science, particularly in reference to Stacks - but what are stacks and how does postfix work? Professor David Brailsford takes us through it.

Upside Down (Huffman) Trees: http://youtu.be/umTbivyJoiI
Quick Sort: http://youtu.be/XE4VP_8Y0BU
Getting Sorted: http://youtu.be/kgBjXUE_Nwc

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Carbon: (C++)++ ? Can Carbon De-Throne C++? - Computerphile

Tue, 29 Sep 2026 05:59:00 -0000

This video features Dr Valerio Guiffrida. Full details plus info on the NVIDIA GTC offer can be found below in the full description ↓↓↓

Carbon is a brand new programming language still under development. It aims to dethrone C++ by being interoperable & compatible in both directions. Dr Guiffreida from the University of Nottingham gives us the lowdown on this ambitious new programming language.

To enter the RTX 4080 Super giveaway (UK, EU, US & Canada only) simply register through the link below to attend the GTC Conference virtually (it’s free) and then complete this form between March 17th and March 24th 2025: https://forms.gle/VTQ3sZJy98Yxo2Y58

Register to attend GTC: https://nvda.ws/42p1nPx

(NVIDIA has sponsored this episode)

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

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What is Bootstrapping? - Computerphile

Tue, 29 Sep 2026 01:59:00 -0000

A little bit of magic - bootstrapping, allows the separation of code and machine, allowing one single piece of code to run on many different machines. Professor Tom Rodden introduces the idea.

EXTRA BITS - Complexity: http://youtu.be/sn5QpZornj0
Reverse Polish and Stacks: Coming Soon

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Behind the Scenes at GTC AI Conference - Computerphile

Mon, 28 Sep 2026 21:59:00 -0000

GTC AI Conference is held each year by Nvidia and showcases AI and related technologies. This year Computerphile visited, here's a taste of what we saw. Full interviews coming soon, and yes, we did speak to him!

#jensenhuang #nvidia #ai #computerscience

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

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The Attack That Could Disrupt The Whole Internet - Computerphile

Mon, 28 Sep 2026 17:59:00 -0000

Audible free book: http://www.audible.com/computerphile
DoS or Denial of Service Attacks are one thing, but Amplified Denial of Service Attacks could threaten the internet itself. Tom Scott explains what they are.

More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott

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Jensen Huang on GPUs - Computerphile

Mon, 28 Sep 2026 13:59:00 -0000

Nvidia CEO and co-founder Jensen Huang on various applications of GPUs and the rise of AI in all aspects of parallel processing.

#nvidia #JensenHuang #Ai #ComputerScience #gaming #GPU #GTC2025

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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The Dawn of Desktop Publishing - Computerphile

Mon, 28 Sep 2026 09:59:00 -0000

Quality printing from your own home is taken for granted, but it wasn't always that way - The Apple Laserwriter gave the original Apple Mac a purpose and cemented its place in the creative industries. We hear from Professor David Brailsford.
Unrolling the Loops - https://youtu.be/guXgBe2wvEA
Little Mac with the Big Bite: http://www.youtube.com/watch?v=NMlbUCAOEXw
Great 202 Jailbreak: http://www.youtube.com/watch?v=CVxeuwlvf8w

For further reading on John Warnock and Steve Jobs check out Conrad Taylor's report on John Warnock: http://bit.ly/warnockreport

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This video was filmed and edited by Sean Riley.

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EXTRA BITS - Installing Ubuntu Permanently - Computerphile

Mon, 28 Sep 2026 01:59:00 -0000

EXTRA BITS on the XP to Ubuntu Story. Having tried Ubuntu first, Joe installs it permanently on the old laptop, formatting the hard drive and erasing XP and the Dell Media Centre OS in the process.

Main XP to Ubuntu Film: http://youtu.be/JAI368bZC1g

EXTRA BITS - Realtime Boot Comparison: http://youtu.be/ondpla1KHAo
EXTRA BITS - Creating a Bootable USB in Linux: http://youtu.be/LonQjMbjZR0

Raspberry Pi Hardware: http://youtu.be/sx2HjuZBuo0

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This video was filmed and edited by Sean Riley.

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Reputation Lag Attack - Computerphile

Sun, 27 Sep 2026 21:59:00 -0000

Discussing how scammers take advantage of the way certain online systems work to leverage the delays. Dr Tim Muller is based at the University of Nottingham.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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EXTRA BITS - Making a Bootable USB in Linux - Computerphile

Sun, 27 Sep 2026 17:59:00 -0000

EXTRA BITS on the XP to Ubuntu Story, here we see Joe re-build the bootable USB stick on his own machine in Ubuntu.

Main XP to Ubuntu Film: http://youtu.be/JAI368bZC1g

EXTRA BITS - Realtime Boot Comparison: http://youtu.be/ondpla1KHAo
EXTRA BITS - Installing Ubuntu: http://youtu.be/ceYeTXHHSa0

Raspberry Pi Hardware: http://youtu.be/sx2HjuZBuo0

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Shortest Path Algorithm Problem - Computerphile

Sun, 27 Sep 2026 13:59:00 -0000

A seemingly simple problem that's "in general" incredibly difficult! CEO of Redwood Research Buck Shlegeris explains his favourite algorithmic fact!

Buck wants to thank his friend Peter Schmidt-Nielsen for telling him this great fact. More on the sums of square roots problem: https://cstheory.stackexchange.com/questions/79/problems-between-p-and-npc#4010

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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EXTRA BITS - Hacktop Real-Time Boot Comparison - Computerphile

Sun, 27 Sep 2026 09:59:00 -0000

EXTRA BITS on the XP to Ubuntu Story.

To give you an idea of the change from before, here are a few minutes showing the relative boot times. This laptop is Sean's own machine which had largely fallen into disuse. Originally bought as a video editing machine in 2006 with successive updates and patches to XP Media Centre Edition, it had become slow enough to make him want to throw it through the nearest window each time he asked it to do a task! - Now, with an inexpensive SSD installed it is his machine of choice....

Main XP to Ubuntu Film: http://youtu.be/JAI368bZC1g

EXTRA BITS - Creating a Bootable USB in Linux: http://youtu.be/LonQjMbjZR0
EXTRA BITS - Installing Ubuntu: http://youtu.be/ceYeTXHHSa0

Raspberry Pi Hardware: http://youtu.be/sx2HjuZBuo0

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This video was filmed and edited by Sean Riley.

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Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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What is CUDA? - Computerphile

Sun, 27 Sep 2026 05:59:00 -0000

What is CUDA and why do we need it? An Nvidia invention, its used in many aspects of parallel computing. We spoke to Stephen Jones, one of the architects of CUDA at the recent GTC conference.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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XP to Ubuntu with an 8yr old Hacktop - Computerphile

Sun, 27 Sep 2026 01:59:00 -0000

Rejuvenating an 'ancient' piece of technology for free with a new operating system. As Windows XP nears end-of-life, we look at whether we can re-purpose old bits of kit for free. Joe Nash gets hacking.

EXTRA BITS - Realtime Boot Comparison: http://youtu.be/ondpla1KHAo
EXTRA BITS - Creating a Bootable USB in Linux: http://youtu.be/LonQjMbjZR0
EXTRA BITS - Installing Ubuntu: http://youtu.be/ceYeTXHHSa0

Raspberry Pi Hardware: http://youtu.be/sx2HjuZBuo0

Laptop Specs: 2006 Dell Inspiron 6400 - Intel Core 2 Duo 1.66Ghz 1GB RAM 5400rpm SATA 160GB HDD - Win XP Media Centre Edition with all updates -
(XP had been reinstalled multiple times, all patches and updates installed, the machine often rebuilt from scratch) - after this film a Crucial SSD was installed and Ubuntu reinstalled.

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This video was filmed and edited by Sean Riley.

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Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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AI's Version of Moore's Law? - Computerphile

Sat, 26 Sep 2026 21:59:00 -0000

This video features Sydney Von Arx --- Check out Brilliant's courses and start for free at https://brilliant.org/computerphile/ (episode sponsor) - More links in description below ↓↓↓

Research suggests the rate at which AI is able to stay 'on task' is doubling every seven months. Is this the AI equivalent of Moore's Law? - Sydney Von Arx works on adversarial stress-testing at METR (Model Evaluation & Threat Research.)

AI digest explainer:
https://theaidigest.org/time-horizons
The Paper:
https://metr.org/blog/2025-03-19-measuring-ai-ability-to-complete-long-tasks/

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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EXTRA BITS - What Makes a Computer? - Computerphile

Sat, 26 Sep 2026 17:59:00 -0000

EXTRA BITS of Brady's conversation with Professor Tom Rodden about what makes a computer.

Main 'Computing' film (Credit Cards and Computing): http://youtu.be/9pA8xMNVPjE

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This video was filmed and edited by Sean Riley.

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Subroutines in Low Level Code - Computerphile

Sat, 26 Sep 2026 13:59:00 -0000

Bashing out low-level code, it can be annoying to re-type the same commands over and over when you need to repeat a routine. Matt Godbolt explains how we can save frequently used code as a subroutine and reuse whenever its needed.

Matt Godbolt is known as the creator of Compiler Explorer, among other things! Find out more about him here: https://xania.org/MattGodbolt

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

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Credit Cards and Invisible Computing - Computerphile

Sat, 26 Sep 2026 09:59:00 -0000

In this era of invisible computing how do you define a computer? Professor Tom Rodden talks to Brady about what counts and what doesn't.

EXTRA BITS: http://youtu.be/xzYOx_gT4_w
Mainframes and the Unix Revolution: http://youtu.be/-rPPqm44xLs
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Hash Collisions and The Birthday Paradox - Computerphile

Sat, 26 Sep 2026 05:59:00 -0000

Mike Pound discusses hash collisions & the birthday paradox -- Learn more and apply to Jane Street’s WiSE program in New York, London or Hong Kong at https://jane-st.co/wise-computerphile (channel sponsor) -- More links in full description below ↓↓↓

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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EXTRA BITS - More on the Original Mac at 30 - Computerphile

Sat, 26 Sep 2026 01:59:00 -0000

The Mac is 30. Love it or loathe it, it certainly had a large impact on the world of computing. Professor Brailsford has some Extra Bits for us.

Main 'Mac at 30' Film: http://youtu.be/NMlbUCAOEXw

To read more stories about the personalities, and the environment within Apple at the time of the Macintosh, you can visit: http://www.bit.ly/30mac30

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This video was filmed and edited by Sean Riley.

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'Forbidden' AI Technique - Computerphile

Fri, 25 Sep 2026 21:59:00 -0000

The so-called 'Forbidden Technique' with Chana Messinger -- Check out Brilliant's courses and start for free at https://brilliant.org/computerphile/ (episode sponsor) -- More links in full description below ↓↓↓

Chana Messinger from 80,000 Hours talks about why we shouldn't give AI access to its own chain-of-thought. More from Chana: https://youtube.com/@chana_messinger

OpenAI paper: https://cdn.openai.com/pdf/34f2ada6-870f-4c26-9790-fd8def56387f/CoT_Monitoring.pdf

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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The Little Mac with the Big Bite - Computerphile

Fri, 25 Sep 2026 17:59:00 -0000

Whether you are a Mac-o-phile or a Mac-o-phobe it is hard to deny the impact of the original Mac. As Mac turns 30, Professor David Brailsford takes us through what the original Mac was like and how it helped people learn to love computers.

EXTRA BITS: http://youtu.be/rbeYwh2CstQ
How YouTube Works: http://www.youtube.com/watch?v=OqQk7kLuaK4

Note: please excuse the flickering on the Mac's CRT monitor, unfortunately we were unable to remove it completely.

To read more stories about the personalities, and the environment within Apple at the time of the Macintosh, you can visit: http://www.bit.ly/30mac30

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This video was filmed and edited by Sean Riley.

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Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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AI Sandbagging - Computerphile

Fri, 25 Sep 2026 13:59:00 -0000

Following the theme of AI research and safety, Aric Floyd talks about how some Large Language Models might follow the all too human trait of sandbagging - "lying" about their true capabilities.

AI Sandbagging Paper: https://www.apolloresearch.ai/research/scheming-reasoning-evaluations

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

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EXTRA BITS: Big Data and T's and C's - Computerphile

Fri, 25 Sep 2026 09:59:00 -0000

More information on just what Terms and Conditions can contain, and what that can mean for your data and your details. Professor Tom Rodden from the University of Nottingham.

Get Literatin, the T's & C's plug-in (for Chrome or Firefox) here: http://bit.ly/literatin

Original "Terms & Conditions" film: https://www.youtube.com/watch?v=9Hb2oMlRI0I

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MikeBot3000: Can We Build an AI Mike from Open Source Tools? - Computerphile

Fri, 25 Sep 2026 05:59:00 -0000

Open source tools for creating videos? Lewis decides to help Mike take a break by creating 'MikeBot3000' - an AI generated Mike Pound...

The 'terminator-style' thumbnail image was created using Chat-GPT

Segments of this video were created using various tools - where closed source tools were used we have stated as such. Lewis' link lower down shows you how he chained the various sections together.

Get your hands on the code here: https://github.com/Lewis-Stuart-11/MikeBot

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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P vs NP on TV - Computerphile

Fri, 25 Sep 2026 01:59:00 -0000

Audible free book & trial at: http://www.audible.com/computerphile
Our thanks to them.
P vs NP in The Simpsons and Futurama. Featuring author Simon Singh.
http://simonsingh.net

Simon on Numberphile: http://bit.ly/SimonSinghPlay

Clarification: NP actually stands for non-deterministic (or nondeterministic) polynomial. Simon did us a favour by speaking off-the-cuff on this topic and it is our fault for not cleaning up things in the edit. However Simon's (excellent) book covers this in more detail (pages 157-159 in hard cover) and, in it, he opts for nondeterministic without the hyphen.

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Film by Sean Riley and Brady Haran.

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Monte Carlo Tree Search - Computerphile

Thu, 24 Sep 2026 21:59:00 -0000

Automating decision processes continued as Professort Nick Hawes of Oxford Robotics Institute explains how Monte Carlo Tree Search works.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Blindly Accepting Terms and Conditions? - Computerphile

Thu, 24 Sep 2026 17:59:00 -0000

Terms & Conditions as complicated to read as the epic poem Beowulf. How many times have you clicked 'agree' without reading any further? Professor Tom Rodden explains.

EXTRA BITS - More on T's & C's: http://www.youtube.com/watch?v=QDyekmgn9dw
Security of Data on Disk: http://www.youtube.com/watch?v=4SSSMi4X_mA

Download the 'Literatin' plug-in from here: http://bit.ly/literatin

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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CPU Interrupts - Computerphile

Thu, 24 Sep 2026 13:59:00 -0000

We're looking at how the CPU deals with the 'outside world' as Matt Godbolt continues his low-level tour of the computer!

Find out more about Matt from his blog: https://bit.ly/C_MGodbolt

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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The Font Magicians - Computerphile

Thu, 24 Sep 2026 09:59:00 -0000

Making fonts look good at low resolutions - many thought the problem insolvable - two men started Adobe and proved them wrong. Professor David Brailsford renders the story.

The Great 202 Jailbreak: http://youtu.be/CVxeuwlvf8w
Mainframes & the Unix Revolution: http://youtu.be/-rPPqm44xLs
Upside Down Trees (Huffman Coding): http://youtu.be/umTbivyJoiI
Typesetters in the '80's: http://youtu.be/XvwNKpDUkiE
Graphics Playlist: http://www.youtube.com/playlist?list=PLzH6n4zXuckrPkEUK5iMQrQyvj9Z6WCrm

Conrad Taylor's report on John Warnock: http://bit.ly/warnockreport

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Super Intelligence Speculation - Computerphile

Thu, 24 Sep 2026 05:59:00 -0000

Looking to the future, just how intelligent might the current crop of Large Language Models get? Daniel Kokotajlo joins us to discuss Ai2027.

Find out more about the AI2027 paper here: http://bit.ly/4k4dIOA

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Smack a Mac (25 years of stress relief) - Computerphile

Thu, 24 Sep 2026 01:59:00 -0000

Professor Martyn Poliakoff from chemistry channel periodicvideos makes a cameo here on Computerphile... More from him at: http://www.youtube.com/periodicvideos

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Video by Sean Riley and Brady Haran

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Reinforcement Learning - Computerphile

Wed, 23 Sep 2026 21:59:00 -0000

Reinforcement Learning is how robots test the water in the real world. -- Check out Brilliant's courses and start for free at https://brilliant.org/computerphile/ (episode sponsor) -- More links in full description below ↓↓↓

Nick Hawes is based at Oxford Robotics Institute.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Floating Point Numbers - Computerphile

Wed, 23 Sep 2026 17:59:00 -0000

Why can't floating point do money? It's a brilliant solution for speed of calculations in the computer, but how and why does moving the decimal point (well, in this case binary or radix point) help and how does it get currency so wrong?

3D Graphics Playlist: http://www.youtube.com/playlist?list=PLzH6n4zXuckrPkEUK5iMQrQyvj9Z6WCrm
The Trouble with Timezones: http://youtu.be/-5wpm-gesOY

More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott

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This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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World Foundation Models - Computerphile

Wed, 23 Sep 2026 13:59:00 -0000

Discussing World Foundation Models with TJ Galda from Nvidia.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Typesetters in the '80s - Computerphile

Wed, 23 Sep 2026 09:59:00 -0000

If you thought mathematics exams were difficult, you should try printing them out! - Professor Brailsford takes us through Nottingham University's path to printing their own papers.

The Great 202 Jailbreak: http://www.youtube.com/watch?v=CVxeuwlvf8w
Democratisation of Fonts: COMING SOON!

Maxwell's Equations Poster: http://www.eprg.org/computerphile/godsaid.pdf
Nottingham Typesetting Implementation: http://www.eprg.org/computerphile/newprotext.pdf

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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CPU Kernel Mode - Computerphile

Wed, 23 Sep 2026 05:59:00 -0000

"If your name's not down, you're not coming in!" - How the CPU's "Bouncer" keeps some memory off-limits. Matt Godbolt continues the series on low-level computing.
#computerscience #cpu #computing

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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EXTRA BITS: More on Barcodes - Computerphile

Wed, 23 Sep 2026 01:59:00 -0000

More information on Aestheticodes

MAIN FILM - The Penguin Barcode: http://www.youtube.com/watch?v=kW39Mt5kscQ

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Zip It! - Finding File Similarity Using Compression Utilities - Computerphile

Tue, 22 Sep 2026 21:59:00 -0000

Finding Genome similarity can just be a case of zipping the relevant files in the right order. Buck Shlegeris is CEO of Redwood Research

Papers:
https://homepages.cwi.nl/~paulv/papers/similarity.pdf
https://pmc.ncbi.nlm.nih.gov/articles/PMC9030035/#sec4-entropy-24-00439

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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The Penguin Barcode - Computerphile

Tue, 22 Sep 2026 17:59:00 -0000

Should computers evolve to read the environment we live in or should we change the environment to make it easier for machines to read? Barcodes and QR codes are ugly, Professor Steve Benford explains a different approach.

EXTRA BITS - More on Barcodes : http://youtu.be/2XdIuTr2uiM
Virtual Machines : http://youtu.be/GIdVRB5yNsk

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Aestheticodes apps:
https://play.google.com/store/apps/details?id=uk.ac.horizon.aestheticodes&hl=en
https://itunes.apple.com/us/app/aestheticodes/id703429621?mt=8

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Memory Mapping - Computerphile

Tue, 22 Sep 2026 13:59:00 -0000

Huge memory addresses mean that not every address is valid. Matt Godbolt explains how the addresses are actually used.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Lights and Shadows in Graphics - Computerphile

Tue, 22 Sep 2026 09:59:00 -0000

Audible free book: http://www.audible.com/computerphile
The latest film of our series on graphics sees John Chapman turning the lights off to explain how we decide if a pixel is in light or shade...

John Chapman is a graphics programmer who blogs here: http://www.john-chapman.net

Graphics series with John Chapman: http://www.youtube.com/playlist?list=PLzH6n4zXuckrPkEUK5iMQrQyvj9Z6WCrm

1/ Universe of Triangles : http://youtu.be/KdyvizaygyY
2/ Power of the Matrix : http://youtu.be/vQ60rFwh2ig
3/ Triangles to Pixels : http://youtu.be/aweqeMxDnu4
4/ Visibility Problem : http://youtu.be/OODzTMcGDD0
5/ Light and Shade in Computer Graphics: http://youtu.be/LUjXAoP5GG0

http://www.facebook.com/computerphile
https://twitter.com/computer_phile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Writing a Text Editor - Computerphile

Tue, 22 Sep 2026 05:59:00 -0000

Writing a text editor can't be that hard can it? Surely just a case of shifting around a bunch of ASCII characters? Dr Steve Bagley is based at the University of Nottingham

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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The Visibility Problem - Computerphile

Tue, 22 Sep 2026 01:59:00 -0000

Which triangles should be in front and which should be behind? The problems computers face when collapsing 3D graphics down to 2 dimensions.

Graphics series with John Chapman:

1/ Universe of Triangles : http://youtu.be/KdyvizaygyY
2/ Power of the Matrix : http://youtu.be/vQ60rFwh2ig
3/ Triangles to Pixels : http://youtu.be/aweqeMxDnu4
4/ Visibility Problem : http://youtu.be/OODzTMcGDD0
5/ Lights and Shadows in Computer Graphics: http://www.youtube.com/watch?v=LUjXAoP5GG0

John Chapman is a graphics programmer who blogs here: http://www.john-chapman.net

http://www.facebook.com/computerphile
https://twitter.com/computer_phile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Gödel's Incompleteness Theorem - Computerphile

Mon, 21 Sep 2026 21:59:00 -0000

Gödel's Incompleteness Theorem explained with Pen, Paper & Lean (the proof assistant) Professor Thorsten Altenkirch is based at the University of Nottingham.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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The Problem with Time and Timezones - Computerphile

Mon, 21 Sep 2026 17:59:00 -0000

A web app that works out how many seconds ago something happened. How hard can coding that be? Tom Scott explains how time twists and turns like a twisty-turny thing. It's not to be trifled with!

A Universe of Triangles: http://www.youtube.com/watch?v=KdyvizaygyY
LZ Compression in Text: http://www.youtube.com/watch?v=goOa3DGezUA
Characters, Symbols and the Unicode Miracle: http://www.youtube.com/watch?v=MijmeoH9LT4

More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott

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This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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The Next Big SHA? SHA3 Sponge Function Explained - Computerphile

Mon, 21 Sep 2026 13:59:00 -0000

Learn more about the Jane Street internship at https://jane-st.co/internship-computerphile-25

If a bug is found in SHA2, SHA3 is already waiting in the wings! Mike Pound takes us through how it works. Dr Mike Pound is based at the University of Nottingham.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Arduino: Hobbyist Electronics to Orbit! - Computerphile

Mon, 21 Sep 2026 09:59:00 -0000

Arduinos are used extensively in hobbyist electronics and hacker culture, but what is an arduino & how can you use them? Joe explains how they're used in both hobby projects and space programmes....

Raspberry Pi Hardware: http://www.youtube.com/watch?v=sx2HjuZBuo0
Texting Cabbage with a Recorder: http://youtu.be/YkPrUkYKy8I

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This video was filmed and edited by Sean Riley.

Joe Nash is president of hacksocnotts (Nottingham University's Hacker Society)
Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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CPU Summary - Computerphile

Mon, 21 Sep 2026 05:59:00 -0000

Bringing together some of the concepts from the series on CPU, Memory & low level computer architecture, Matt Godbolt explains how an Operating System might work in conjunction with some of the other concepts to provide the user with a seamless experience.

Find the whole series of Matt's videos here: https://www.youtube.com/playlist?list=PLzH6n4zXuckpwdGMHgRH5N9xNHzVGCxwf

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Triangles to Pixels - Computerphile

Mon, 21 Sep 2026 01:59:00 -0000

Audible free book: http://www.audible.com/computerphile
How do we go from 3D representations within a computer to pixels on a screen? John Chapman has the details!

John Chapman is a graphics programmer who blogs here: http://www.john-chapman.net

Graphics series with John Chapman:

1/ Universe of Triangles : http://youtu.be/KdyvizaygyY
2/ Power of the Matrix : http://youtu.be/vQ60rFwh2ig
3/ Triangles to Pixels : http://youtu.be/aweqeMxDnu4
4/ Visibility Problem : http://youtu.be/OODzTMcGDD0

5/ Light and Shade in Computer Graphics: Coming Soon

http://www.facebook.com/computerphile
https://twitter.com/computer_phile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

Learn more about your ad choices. Visit megaphone.fm/adchoices

How Generative AI Video Works - Computerphile

Sun, 20 Sep 2026 21:59:00 -0000

Following on from 'MikeBot3000' we're delving into just how the Generative AI systems create video. Lewis Stuart is based at the University of Nottingham

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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EXTRA BITS - Printing and Typesetting History - Computerphile

Sun, 20 Sep 2026 17:59:00 -0000

More information on the background of Printing and Typesetting to complement "The Great 202 Jailbreak" film which can be seen here: http://youtu.be/CVxeuwlvf8w

http://www.facebook.com/computerphile
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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Sleeper Agents in Large Language Models - Computerphile

Sun, 20 Sep 2026 13:59:00 -0000

It's an older paper, but it checks out. Rob Miles discusses the problem of 'Sleeper Agents' - where LLMs could have hidden traits we don't know about until it's too late.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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The Great 202 Jailbreak - Computerphile

Sun, 20 Sep 2026 09:59:00 -0000

Before laser-printers, high quality print-outs were the domain of typesetters, expensive and tightly controlled. In 1979 a Bell Labs team reverse engineered one in their summer vacation. Professor Brailsford has the details.

EXTRA BITS - More on Printing and Typesetting History: https://www.youtube.com/watch?v=HdModNEK_1U
Mainframes and the Unix Revolution: http://youtu.be/-rPPqm44xLs

To find out how the 1980 Bell Labs `vacation memo' was completely rebuilt,
in 2013, visit:

http://www.eprg.org/papers/202paper.pdf

If you want to see the `vacation memo' itself -- in its original scanned-in form and after being rebuilt -- then visit:

http://www.cs.princeton.edu/~bwk/202

The memorandum gives an outline of how the `reverse engineering' of the 202 was accomplished.

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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HyperLogLog Hit Counter - Computerphile

Sun, 20 Sep 2026 05:59:00 -0000

How do huge websites keep track of the traffic numbers? Buck Shlegeris outlines the probabilistic counting algorithm 'Hyperloglog.'

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Learn more about your ad choices. Visit megaphone.fm/adchoices

The True Power of the Matrix (Transformations in Graphics) - Computerphile

Sun, 20 Sep 2026 01:59:00 -0000

"The Matrix" conjures visions of Keanu Reeves as Neo on the silver screen, but matrices have a very real use in manipulating 3D graphics. John Chapman explains the true power of the matrix.

Graphics series with John Chapman:

1/ Universe of Triangles : http://youtu.be/KdyvizaygyY
2/ Power of the Matrix : http://youtu.be/vQ60rFwh2ig
3/ Triangles to Pixels : http://youtu.be/aweqeMxDnu4
4/ Visibility Problem : http://youtu.be/OODzTMcGDD0

5/ Light and Shade in Computer Graphics: Coming Soon

John Chapman is a graphics programmer who blogs here: http://www.john-chapman.net

How NOT to store Passwords: http://www.youtube.com/watch?v=8ZtInClXe1Q

Addendum - at 12:35 the formula should read: x*0+y*0+1*1

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This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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SHA2 Fatal Flaw? (Hash Length Extension Attack) - Computerphile

Sat, 19 Sep 2026 21:59:00 -0000

SHA2's weakness explained by Dr Mike Pound -- Check out Brilliant's courses and start for free at https://brilliant.org/computerphile/ (episode sponsor) -- More links in full description below ↓↓↓

SHA2 is susceptible to a length extension attack, meaning supposedly secure messages can be added to and still pass certain security tests.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Learn more about your ad choices. Visit megaphone.fm/adchoices

Cross Site Request Forgery - Computerphile

Sat, 19 Sep 2026 17:59:00 -0000

If you don't secure your web forms, one mistaken click could be all it takes for your users to delete their own accounts. Tom Scott explains.

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More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott

Hacking Websites with SQL Injection: http://www.youtube.com/watch?v=_jKylhJtPmI
Cracking Websites with Cross Site Scripting: http://www.youtube.com/watch?v=L5l9lSnNMxg

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

Learn more about your ad choices. Visit megaphone.fm/adchoices

Coding a SHA2 Length Extension Attack - Computerphile

Sat, 19 Sep 2026 13:59:00 -0000

Mike Pound codes up a demo of the length extension attach he explained in our previous video. Mike is based at the University of Nottingham.

Code link: http://GitHub.com/mikepound/length-extension

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Learn more about your ad choices. Visit megaphone.fm/adchoices

A Universe of Triangles - Computerphile

Sat, 19 Sep 2026 09:59:00 -0000

We see objects all the time and our brains decode the 3D shapes, but how do computers model these shapes and why break it all down to triangles?

Graphics series with John Chapman:

1/ Universe of Triangles : http://youtu.be/KdyvizaygyY
2/ Power of the Matrix : http://youtu.be/vQ60rFwh2ig
3/ Triangles to Pixels : http://youtu.be/aweqeMxDnu4
4/ Visibility Problem : http://youtu.be/OODzTMcGDD0

5/ Light and Shade in Computer Graphics: Coming Soon

John Chapman is a graphics programmer who blogs here: http://www.john-chapman.net

http://www.facebook.com/computerphile
https://twitter.com/computer_phile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

Learn more about your ad choices. Visit megaphone.fm/adchoices

What is Bootstrapping Anyway? - Computerphile

Sat, 19 Sep 2026 05:59:00 -0000

Where does it all start? How is it was say "C is written in C" - Matt Godbolt breaks it down by building it up!

Find out more about Matt from his blog: https://bit.ly/C_MGodbolt

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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A New Golden Age of Video Games - Computerphile

Sat, 19 Sep 2026 01:59:00 -0000

As two new games consoles are released on to the market - Ian talks about how gaming has instead been revolutionised by stealth - via smart-phones & tablets.

Ian Livingstone is Life President of Square Enix and Eidos.

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This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Network Layers Model (Networking Basics) - Computerphile

Fri, 18 Sep 2026 21:59:00 -0000

"The best-laid plans of mice and men often go awry" - as the ISO team were designing a beautiful, structured layered model, people were already building their own. Dr Richard G Clegg of Queen Mary University London explains the network layers model.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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How NOT to Store Passwords! - Computerphile

Fri, 18 Sep 2026 17:59:00 -0000

Security of users' passwords should be at the forefront of every web developer's mind. Tom takes us through the insecure ways in which some websites deal with passwords.

Note: At circa 8mins, the animation does not show how the 'salt' is also stored in the database alongside the username.

Hashing Algorithms and Security: http://youtu.be/b4b8ktEV4Bg
Security of Data on Disk: http://youtu.be/4SSSMi4X_mA

More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott

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This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Cloning Yourself in AI using LoRA - Computerphile

Fri, 18 Sep 2026 13:59:00 -0000

Amazing photo-realistic video generation is one thing, but being able to insert yourself in there, how does that work? Lewis Stuart from the University of Nottingham explains how a LoRA means you don't have a huge retraining job on your hands!

This video was previously titled "How Sora2's AI Video Generator Can Clone You" but the video is more about LoRA than Sora.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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How YouTube Works - Computerphile

Fri, 18 Sep 2026 09:59:00 -0000

How does YouTube work and why do videos buffer? See more in the full description.

Our thanks to the staff at YouTube for giving us their time.

Characters, Symbols & the Unicode Miracle: http://youtu.be/MijmeoH9LT4
YouTube's Secret Algorithm: https://www.youtube.com/watch?v=BsCeNCVb-d8

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Video by Sean Riley and Brady Haran.

NOTE ONE: This was filmed at YouTube HQ in San Bruno. It was filmed before the much-discussed changes were made to YouTube comments section - we have not asked questions about that.

NOTE TWO: This is a Computerphile video - it was NOT made by YouTube or reflect the company's official views. Staff were kind enough to answer some of our questions (well, most of them), but they did not edit the video or "approve" it - any mistakes in the editing or animations are most likely our own.

NOTE THREE: A video about the YouTube algorithm (how videos are recommended) is coming soon to Computerphile - so you really should subscribe.

NOTE FOUR: The snowboarder is Sean!

NOTE FIVE: Music on snowboarding film courtesy Hudson Super Six
http://www.facebook.com/hudson.supersix

NOTE SIX: Error on the graphics where it says 320p - actually should read 360p

Why views stick at 301: http://youtu.be/oIkhgagvrjI

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How Computers Store Data Serially - Computerphile

Fri, 18 Sep 2026 05:59:00 -0000

How does data get organised to be stored or sent serially? Matt Godbolt explains some of the encoding used in old devices like floppy disks.

nb At around 10:45 the illustration is inaccurate - when it show the binary numbers, the binary numbers actually occur at a switch of magnetic flux direction rather than being a result of the direction of the flux.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Hashing Algorithms and Security - Computerphile

Fri, 18 Sep 2026 01:59:00 -0000

Audible free book: http://www.audible.com/computerphile
Hashing Algorithms are used to ensure file authenticity, but how secure are they and why do they keep changing? Tom Scott hashes it out.

More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott

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This video was filmed and edited by Sean Riley.

Pigeon Sound Effects courtesy of http://www.freesfx.co.uk/

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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How IP Addresses Relate to Physical Locations - Computerphile

Thu, 17 Sep 2026 21:59:00 -0000

IP Location services almost work by accident rather than by design, Richard explains how they operate. Richard G Clegg is based at Queen Mary University of London.

The video title previously mentioned ISPs which was confusing, title edited for clarity. (an A/B thumbnail test also had some ambiguity so the thumbnail has been locked to one saying 'location services')

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Texting Cabbage with a Recorder - Computerphile

Thu, 17 Sep 2026 17:59:00 -0000

How many words can you type if you are restricted to a musical typewriter? HackSocNotts competed in a hack-athon and came up with this! Hackathons are endurance coding events which can lead to all sorts of strange hybrid ideas becoming reality.

Correction: at 3mins in Paula meant to say 2 to the power 8 (2^8) not 8 factorial.

Hashing Algorithms: COMING SOON!
Musical Floppy Drives: http://www.youtube.com/watch?v=C3dU5u4xXaY

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This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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How Ethernet Sends Data - Computerphile

Thu, 17 Sep 2026 13:59:00 -0000

How the data flowing through your cables is organised with Matt Godbolt -- See Jane Street’s training programs in New York, London or Hong Kong at https://jane-st.co/Computerphile-programs (channel sponsor) -- More links in full description below ↓↓↓

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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EXTRA BITS - Text Compression Meets Probabilities - Computerphile

Thu, 17 Sep 2026 09:59:00 -0000

The LZ Compression technique implicitly works out its own probabilities for a given document. Professor Brailsford explains.

Main LZ compression film: http://youtu.be/goOa3DGezUA

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This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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The Problem with A.I. Slop! - Computerphile

Thu, 17 Sep 2026 05:59:00 -0000

Researchers suggested there's more AI generated content appearing on the web than human generated content - Mike Pound from the University of Nottingham talks about why this might be a problem.

Find the paper Mike's referencing here: https://bit.ly/C_AiSlop-GenWebpagesPaper

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Elegant Compression in Text (The LZ 77 Method) - Computerphile

Thu, 17 Sep 2026 01:59:00 -0000

Text compression methods such as LZ can reduce file sizes by up to 80%. Professor Brailsford explains the nuts and bolts of how it is done.

Original Compression film: http://youtu.be/Lto-ajuqW3w
EXTRA BITS - Text Compression meets probabilities: http://youtu.be/cCDCfoHTsaU
Cross Site Scripting with Tom Scott: http://youtu.be/L5l9lSnNMxg

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Path Planning for Robotics - Computerphile

Wed, 16 Sep 2026 21:59:00 -0000

Need to get to your goal quickly? Ensure you plan the right path! Robots need to work out how to get from here to there somehow! Ayse explains some of the methods they choose. Assistant Professor Ayse Kucukyilmaz is based at the University of Nottingham

Thanks to Dave Domminney Fowler for kindly helping with Sean's botched 2nd camera footage - more about Dave here: https://www.youtube.com/c/daviddomminneyfowler

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Cloud Computing (Cloudy with a Chance of Pizza) - Computerphile

Wed, 16 Sep 2026 17:59:00 -0000

The Cloud is a term applied to seemingly anything internet related, but what is cloud computing and how is it different? Dr Taha Osman explains how cloud computing even powers pizza ordering portals.

Dr Osman is a Principal Lecturer and reads Service-Centric & Cloud Computing and Semantic Web Technologies at Nottingham Trent University (NTU)

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This video was filmed and edited by Sean Riley.

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Code Optimisation via Memoization - Computerphile

Wed, 16 Sep 2026 13:59:00 -0000

Learn this caching trick for faster code from Dr Mike Pound -- Check out Brilliant's courses and start for free at https://brilliant.org/computerphile/ (episode sponsor) -- More links in full description below ↓↓↓
Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Cracking Websites with Cross Site Scripting - Computerphile

Wed, 16 Sep 2026 09:59:00 -0000

Audible free book: http://www.audible.com/computerphile
JavaScript is dangerous! Why? How are websites vulnerable to it? Find out about bug-bounties from Tom Scott.

More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott

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This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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The Hard Problem of Controlling Powerful AI Systems - Computerphile

Wed, 16 Sep 2026 05:59:00 -0000

As AI systems become more capable, rule-based safeguards, hard-coded restrictions, and simple alignment strategies start to break down. Buck Shlegeris talks about some tactics we might use as detailed in a recent paper.

The referenced paper: https://arxiv.org/abs/2504.10374

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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EXTRA BITS/TRITS - Huffman Trees - Computerphile

Wed, 16 Sep 2026 01:59:00 -0000

More about Huffman trees and how they can even work for a trinary system.

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Procedural Generation in Games - Computerphile

Tue, 15 Sep 2026 21:59:00 -0000

Procedural generation is the idea of using simple rules to generate more complicated items - used in games such as Minecraft and Elite, Zac Garby of the University of Nottingham explains with the use of the game Carcassonne.

Zac would like to thank user mlin92 for the graphics used in his generation code.
Zac's GitHub: https://github.com/zac-garby/carcassonne

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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How Huffman Trees Work - Computerphile

Tue, 15 Sep 2026 17:59:00 -0000

How do we derive the most compact codes for a situation? Huffman Trees can help. Professor Brailsford explains how computer scientists like their trees to be upside down.

"Entropy in Compression - Computerphile" precedes this: http://www.youtube.com/watch?v=M5c_RFKVkko

EXTRA BITS: More on Huffman Trees: http://www.youtube.com/watch?v=DV8efuB3h2g
Error Correction: http://www.youtube.com/watch?v=5sskbSvha9M

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Gen AI and Reinforcement Learning- Computerphile

Tue, 15 Sep 2026 13:59:00 -0000

The real-world doesn't graph well. Sydney Von Arx discusses GenAI & RL -- See Jane Street’s training programs in New York, London or Hong Kong at https://jane-st.co/hkginternship26-computerphile (channel sponsor) -- More links in full description below ↓↓↓

Sydney Von Arx of METR talks about an approach to solve Reinforcement Learning & gradient descent with real world problems.

More about Sydney: https://bit.ly/4aqm1mG

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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The Grid, CERN's Global Supercomputer - Computerphile

Tue, 15 Sep 2026 09:59:00 -0000

CERN developed their 'Grid' before the world wide web took off. Maria and Andrzej explain how it does a lot more than just share the reams of data the Large Hadron Collider collects.

Correction: at 1min 16s, Maria meant to say 10 Gigabits Per Second (not gigabytes)

CERN Computing Centre (& Mouse Farm): http://www.youtube.com/watch?v=S0MgJFGL5jg

Maria Alandes Pradillo - Grid Information System expert
Andrzej Nowak - CERN Openlab CTO Office

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This video was edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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How Passkeys Work - Computerphile

Tue, 15 Sep 2026 05:59:00 -0000

Passkey pop up everywhere, Mike Pound explains what they are! Check out Brilliant's courses and start for free at https://brilliant.org/computerphile/ (episode sponsor) -- More links in full description below ↓↓↓

Dr Mike Pound is based at the University of Nottingham.

This video was previously titled "What is a Passkey?"

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Hacking Websites with SQL Injection - Computerphile

Tue, 15 Sep 2026 01:59:00 -0000

Websites can still be hacked using SQL injection - Tom explains how sites written in PHP (and other languages too) can be vulnerable and have basic security issues.

More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott

Follow the Cookie Trail: http://www.youtube.com/watch?v=LHSSY8QNvew
CERN Computing Centre & Mouse Farm: http://www.youtube.com/watch?v=S0MgJFGL5jg

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This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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The Return of Festive Flashing Lights - Computerphile

Mon, 14 Sep 2026 21:59:00 -0000

Steve gets all festive and tries to improve on the festive lights he built a mere 11 years ago...

Dr Steve Bagley is based at the University of Nottingham.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Virtual Machines Power the Cloud - Computerphile

Mon, 14 Sep 2026 17:59:00 -0000

The number of virtual machines has swelled due to cloud computing & changes to the X86 processor, but what are Virtual Machines and how do they run legacy software alongside cutting edge code? Derek McAuley explains.

Punch Card Programming: www.youtube.com/watch?v=KG2M4ttzBnY
Encryption and Security Agencies: www.youtube.com/watch?v=sWeVOXpTOhk
CERN Computing Centre (and mouse farm): http://www.youtube.com/watch?v=S0MgJFGL5jg

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This video was filmed and edited by Sean Riley.

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Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Do Computer Scientists Prefer Tea or Coffee? (Microphone Sound Check Question 2025) - Computerphile

Mon, 14 Sep 2026 13:59:00 -0000

Whenever we're setting up to record a video we ask a question to get the contributor to talk so we can check their microphone is working and set a level for recording. Traditionally, people ask 'what did you have for breakfast?' - we ask something different each year!

Make sure you suggest your 2026 soundcheck question by commenting on the video!

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Encryption and Security Agencies - Computerphile

Mon, 14 Sep 2026 09:59:00 -0000

News stories surface every day about how National Security Agencies have broken encryption, but what is media 'hype' and what's the truth? - Richard Mortier explains.

Security of Data on Disk - Computerphile
http://www.youtube.com/watch?v=4SSSMi4X_mA

Characters, Symbols and the Unicode Miracle
http://www.youtube.com/watch?v=MijmeoH9LT4

Random Numbers - Numberphile
http://www.youtube.com/watch?v=SxP30euw3-0

Encryption and HUGE numbers - Numberphile
http://www.youtube.com/watch?v=M7kEpw1tn50

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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LLMs and Newcomb's Problem - Computerphile

Mon, 14 Sep 2026 05:59:00 -0000

Newcomb's Problem is a thought experiment which, on the surface, seems obvious, but what if you're trying it out on your identical twin? Which choice is best? Aric Floyd demonstrates it, then tries it on Anthropic's Claude, which doesn't always play ball!

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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How Intelligent is Artificial Intelligence? - Computerphile

Mon, 14 Sep 2026 01:59:00 -0000

How far have we come with Artificial Intelligence? Are there intelligent machines, or have we changed the world to allow dumb machines to behave intelligently?

Luciano Floridi is Professor of Philosophy and Ethics of Information at the University of Oxford. He is Senior Research Fellow at the Oxford Internet Institute and Fellow of St Cross College. He was previously Professor of Philosophy and UNESCO Chair in Information and Computer Ethics at the University of Hertfordshire.

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This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Implementing Passkeys in Practice - Computerphile

Sun, 13 Sep 2026 21:59:00 -0000

Build your own passkey system like Mike! -- Check out Brilliant for free at https://brilliant.org/computerphile/ (30-day free trial and 20% discount on premium subscription... episode sponsor) -- More links in full description below ↓↓↓

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Learn more about your ad choices. Visit megaphone.fm/adchoices

Gesture Controls - Computerphile

Sun, 13 Sep 2026 17:59:00 -0000

How are gesture controls turned into game commands? How can these gestures aid people in rehabilitation? Nottingham Trent University's Interactive Systems Research Group show us their work with wii and kinect technologies.

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This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Generating 3D Models with Diffusion - Computerphile

Sun, 13 Sep 2026 13:59:00 -0000

When the 3D dataset is too small to create models of frogs on stilts we have to think of a different way - Lewis Stuart is based at the University of Nottingham and explains how you can use 2D diffusion to create 3D models.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

Learn more about your ad choices. Visit megaphone.fm/adchoices

Characters, Symbols and the Unicode Miracle - Computerphile

Sun, 13 Sep 2026 09:59:00 -0000

Audible free book: http://www.audible.com/computerphile
Representing symbols, characters and letters that are used worldwide is no mean feat, but unicode managed it - how? Tom Scott explains how the web has settled on a standard.

More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott

EXTRA BITS: http://youtu.be/qBex3IDaUbU
Data Security: http://youtu.be/4SSSMi4X_mA

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This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

Learn more about your ad choices. Visit megaphone.fm/adchoices

Network Basics - Transport Layer and User Datagram Protocol Explained - Computerphile

Sun, 13 Sep 2026 05:59:00 -0000

Breaking the network layer model into pieces, starting top-down, Richard G Clegg of Queen Mary University London explains the 'bargain bucket' of networking!

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Security of Data on Disk - Computerphile

Sun, 13 Sep 2026 01:59:00 -0000

Deleting files may not mean they're gone. Even overwriting them isn't safe. Professor Derek McAuley explains.

EXTRA BITS - more on Flash/SSD: http://youtu.be/HQWFCDN9VZI
Punch Card Programming: http://youtu.be/KG2M4ttzBnY

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Thanks to Richard Faulkner for the photo of the hard disk being destroyed.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Digital Signal Processing With Audio Data - Computerphile

Sat, 12 Sep 2026 21:59:00 -0000

Demonstrating that you can filter data to smooth out the numbers, but whether it's weather data, stock market information or Taylor Swift, the math is the same! David Domminney Fowler takes us through it.

Find out more from Dave at https://www.youtube.com/c/DavidDomminneyFowler

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Home-Made Code - Computerphile

Sat, 12 Sep 2026 17:59:00 -0000

You, the Computerphile viewers sent us your code - Brady takes a first look at some of the things you sent us!

Original film where we asked for code: http://youtu.be/owz7XExO-Wk
An extra review we trimmed from this video: http://youtu.be/ngOVI5YuPmw
Send your code to sean.computerphile@gmail.com

Mohamed's Javagame github page:
https://github.com/redomar/JavaGame

(Mohamed wanted to apologise and points out that he used vanZeben code in his program)

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This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Bad Bot Problem - Computerphile

Sat, 12 Sep 2026 13:59:00 -0000

Following a report on the situation with Social Media and bots, Lewis Stuart of University of Nottingham is inspired to see just how easy it is to fire up his own botnet and puts them to work on a fake social media site: 'scroll hole.'

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Error Correction - Computerphile

Sat, 12 Sep 2026 09:59:00 -0000

What good is knowing you have a problem if you can't fix it? - Professor Brailsford explains Hamming Codes and how errors can not just be detected, but also corrected.

Original Compression film: http://youtu.be/Lto-ajuqW3w
Entropy in Compression: http://youtu.be/M5c_RFKVkko
Error Detection: http://youtu.be/-15nx57tbfc

Home-made Video Arcade: http://youtu.be/pcR7ylW-Gok
BASIC & Sorting: http://youtu.be/Ou2A-JWszVA

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Cyclic Redundancy Check (CRC) - Computerphile

Sat, 12 Sep 2026 05:59:00 -0000

A checksum that's robust & trivial to compute with Matt Godbolt -- Check out Brilliant's courses and start for free at https://brilliant.org/computerphile/ (episode sponsor) -- More links in full description below ↓↓↓

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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CERN Computing Centre (and mouse farm) - Computerphile

Sat, 12 Sep 2026 01:59:00 -0000

The CERN computer grid processes the information from the world's most powerful particle accelerator. Brady gives us a tour of the heart of the operation: CERN's Tier 0.

CERN Interviews: http://youtu.be/cj8ZNgnzSSU

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Film by Brady Haran.

Computerphile is a sister project to Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Coding a Guitar Sound in C - Computerphile

Fri, 11 Sep 2026 21:59:00 -0000

Signal processing is just mathematics, so lets code a guitar sound in C. Dave Domminney Fowler continues the Digital Signal Processing conversation to show how your favourite tunes all rely on DSP.

Find out more from Dave at @domminney

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Programming Paradigms - Computerphile

Fri, 11 Sep 2026 17:59:00 -0000

There are different styles of programming, some quite closely resemble pure mathematics. Mathematician and Computer Scientist Laurence Day compares two of them.

Note: In the Java code the delimiters within the 'for' loop should be semi-colons, not commas. Apologies for the error.

What if the Universe is a Computer Simulation: http://youtu.be/YOxDb_BbXzU
Sights and Sounds of Sorting with BASIC: http://youtu.be/Ou2A-JWszVA

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Vector Search with LLMs - Computerphile

Fri, 11 Sep 2026 13:59:00 -0000

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Network Address Translation - Computerphile

Fri, 11 Sep 2026 09:59:00 -0000

IPv4 ran out of space, so how are we still all looking at the internet? - NAT has the answer! - Richard Mortier explains how the IP address space was expanded upon.

Network Stacks: http://youtu.be/PG9oKZdFb7w
IP addresses: http://youtu.be/L6bDA5FK6gs

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at:http://periodicvideos.blogspot.co.uk/...

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Temporal Networks, Where Page Rank meets Lord of the Rings - Computerphile

Fri, 11 Sep 2026 05:59:00 -0000

When considering how things connect together in a network, time can be an extremely important factor. Dr Richard G Clegg of Queen Mary University London takes us through networks using Page rank and Lord of the Rings.

nb. this film contains two fellas getting the facts of Lord of the Rings wrong on multiple occasions, we look forward to the inevitable comments.

Richard's github: https://github.com/richardclegg/computerphile_demos/

The open source software Richard mentioned can be found at https://raphtory.com

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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EXTRA BITS - Behind the scenes on Computerphile - Computerphile

Fri, 11 Sep 2026 01:59:00 -0000

Professor Brailsford discusses the odd mistake that may have been made, including the omission of a certain Richard Stallman from our Mainframes & Unix film!

Original Punch Cards Film: http://youtu.be/KG2M4ttzBnY
Extra Material on Punch Cards: http://youtu.be/lkSGMrH5Kic

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Haptic Rendering - Computerphile

Thu, 10 Sep 2026 21:59:00 -0000

Haptics, often associated with video game controllers, are systems that provide a touch sensation for users, but how do we calculate the forces involved? Associate Professor of Robotics and Autonomous Systems Dr Ayse Kucukyilmaz is based at the University of Nottingham.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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EXTRA BITS - More about Punch Cards - Computerphile

Thu, 10 Sep 2026 17:59:00 -0000

Extra Bits of material about punch cards from Professor Brailsford.

Original Punch Cards Film: http://youtu.be/KG2M4ttzBnY
Extra Material - behind the scenes: http://youtu.be/Wi326Leuemg

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Post Quantum Cryptography - Computerphile

Thu, 10 Sep 2026 13:59:00 -0000

Prepping for Post-Quantum, Mike Pound explains why now! -- Try Jane Street’s neural net puzzle: https://jane-st.co/computerphile-neural-net-puzzle (channel sponsor) -- More links in full description below ↓↓↓

Computerphile is supported by Jane Street. Learn more about ML at Jane Street here: https://jane-st.co/Computerphile-JS-ML

As we move toward a world where Quantum Computing can break certain cryptographic codes, a post-quantum period, things are changing in the world of cryptograhy. Dr Mike Pound is based at the University of Nottingham.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Punch Card Programming - Computerphile

Thu, 10 Sep 2026 09:59:00 -0000

How did punch card systems work? Professor Brailsford delves further into the era of mainframe computing with this hands-on look at punch cards.

Extra Material on Punch Cards: http://youtu.be/lkSGMrH5Kic
Extra Material - behind the scenes: http://youtu.be/Wi326Leuemg

Mainframes to Unix: http://www.youtube.com/watch?v=-rPPqm44xLs
Near to the Metal: http://www.youtube.com/watch?v=uNuFVq5QeRk

Addendum: "ICL punched cards actually have 12 rows -- not 11 as stated in the film. Choosing any two hole positions out of 12 gives 66 combinations -- which can represent 66 different characters. This in turn is more than enough for the 64 possibilities of a 6-bit character held in ICL computer memory. Also, some special characters could actually utilise three hole configurations adding further to the possibilities."

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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Oversampling Data (Explained with Audio) - Computerphile

Thu, 10 Sep 2026 05:59:00 -0000

If you run out of headroom with your chosen sample rate, how do you avoid the problems of unwanted harmonics? - Dave Domminney Fowler explains how oversampling can help.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Birthplace of the World Wide Web - Computerphile

Thu, 10 Sep 2026 01:59:00 -0000

CERN is a famous centre for scientific research, but it's also where the WWW was "invented". More about CERN's computing power coming soon!!!

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This video by Brady Haran.

Computerphile is a sister project to Numberphile.

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Original Hello World in "B" Programming Language - Computerphile

Wed, 09 Sep 2026 21:59:00 -0000

B is the forerunner to C - but seemed lost - Angelo Papenhoff decided to change it and brought it back from the brink! Here he tries to recreate Brian Kernighan's original 'Hello World' with a few wrinkles!

Angelo's B compiler is here: https://github.com/aap/b
Angelo's emulators: https://github.com/aap/blincolnlights

There's a type in the end of the video, it should of course read "Obsolescence"

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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What if the Universe is a Computer Simulation? - Computerphile

Wed, 09 Sep 2026 17:59:00 -0000

Free book: http://www.audible.com/computerphile
What if the Universe is just a computer simulation? What is fundamental particles are really just "bits"?

Featuring physicist Phil Moriarty from the University of Nottingham.

Also check out our Scale of the Universe song on Sixty Symbols: http://youtu.be/XRdh8gmVR90

See more of Phil at Sixty Symbols - http://www.youtube.com/sixtysymbols

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This video was filmed and edited by Brady Haran.

Computerphile is a sister project to Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

Game of Life: http://www.bitstorm.org/gameoflife/

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Finding Hardware Bugs - Computerphile

Wed, 09 Sep 2026 13:59:00 -0000

When you're setting your hardware design out using automated tools is essential, but what if the tools themselves have bugs in them? John P Wickerson is based at Imperial College London.

The paper that John's team wrote about the work: https://johnwickerson.github.io/papers/fuzzing_pnr.pdf

An accessible blogpost John wrote about the work: https://johnwickerson.wordpress.com/2026/01/06/finding-bugs-in-fpga-place-and-route-tools/

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Programming BASIC and Sorting - Computerphile

Wed, 09 Sep 2026 09:59:00 -0000

The sights and sounds of sorting! - Alex takes inspiration from our BBC microcomputer film and combines BASIC programming with some popular sorting algorithms.

Get Sorted: http://youtu.be/kgBjXUE_Nwc
BBC B Microcomputer: http://youtu.be/do6xydtcVPk
Network Stacks and the internet: http://youtu.be/PG9oKZdFb7w
Quick Sort: http://youtu.be/XE4VP_8Y0BU

The YouTube films that inspired Alex:
http://www.youtube.com/watch?v=m1PS8IR6Td0
http://www.youtube.com/watch?v=t8g-iYGHpEA
http://www.youtube.com/watch?v=kPRA0W1kECg

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at:http://periodicvideos.blogspot.co.uk/...

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Hacking on the PDP1 Raspberry Pi Emulator - Computerphile

Wed, 09 Sep 2026 05:59:00 -0000

The PDP1 was a groundbreaking computer from the 1950's - but where does it fit into computing history and how would you use it? Thanks to Angelo Papenhoff from "Obsolescence Guaranteed" for demonstrating the PiDP1 emulator!

Obsolescence Guaranteed: https://obsolescence.dev/

Minskytron online: https://www.masswerk.at/minskytron/

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

Code for the circle:
00001 / circle
00002 100/
000100 200113 00003 go, lac x
000101 761000 00004 lup, cma
000102 675017 00005 sar 4s
000103 400114 00006 add y
000104 240114 00007 dac y
000105 220114 00008 lio y
000106 675017 00009 sar 4s
000107 400113 00010 add x
000110 240113 00011 dac x
000111 730007 00012 dpy
000112 600101 00013 jmp lup
00014
000113 200000 00015 x, 200000
000114 000000 00016 y, 0
00017
00018 start go

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Error Detection and Flipping the Bits - Computerphile

Wed, 09 Sep 2026 01:59:00 -0000

Devising codes for different weather states is all well and good, but what if the weather strikes back? Electrical storms can distort codes and noisy lines can confuse things, Professor Brailsford shows us one way of building redundancy into the system.

Is Zero Even? - Numberphile: http://www.youtube.com/watch?v=8t1TC-5OLdM
Mainframes and the Unix Revolution: http://www.youtube.com/watch?v=-rPPqm44xLs
A Career in Video Games: http://www.youtube.com/watch?v=Q9igeV_YV-s

Professor Brailsford on Compression: http://www.youtube.com/watch?v=Lto-ajuqW3w
Professor Brailsford on Entropy in Compression: http://www.youtube.com/watch?v=M5c_RFKVkko

Sound Effects courtesy of http://www.freesfx.co.uk/

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at:http://periodicvideos.blogspot.co.uk/...

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Why Multi-Threaded Code Can Sometimes Misbehave (Weak Memory Concurrency) - Computerphile

Tue, 08 Sep 2026 21:59:00 -0000

Learn more and apply to Jane Street’s WiSE program in New York, London or Hong Kong: https://jane-st.co/Computerphile-WiSE-2026 (episode sponsor)
Professor Azalea Raad leads the Veritas Lab at Imperial College London... More information about this video in the full description below.

This video is about how Weak Memory Concurrency can cause multiple threads to do unexpected things!

Azalea Raad: https://profiles.imperial.ac.uk/azalea.raad

Learn more and apply to Jane Street’s WiSE program in New York, London or Hong Kong: https://jane-st.co/Computerphile-WiSE-2026

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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A Career in Video Games - Computerphile

Tue, 08 Sep 2026 17:59:00 -0000

His career in games has stretched from the earliest home video games to the latest - now he wants to inspire youngsters to get involved and obtain the skills to have their own career in the video games industry. Ian Livingstone is Life President of Square Enix and Eidos.

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Eureka box art courtesy of www.64sets.com

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at:http://periodicvideos.blogspot.co.uk/...

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The "Trick" that Compilers Use for Long Division - Computerphile

Tue, 08 Sep 2026 13:59:00 -0000

Long division can be arduous - division in general is something that even computer processors try to avoid with a simple technique. Matt Godbolt demos it and then shows how a simple C program can cause a compiler to employ this trick.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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IP Addresses and the Internet - Computerphile

Tue, 08 Sep 2026 09:59:00 -0000

IP addresses explained - what do these mysterious numbers and dots mean and how are they used? Richard Mortier explains the idea of the addresses behind the internet protocol.

Network Address Translation (NAT): https://youtu.be/01ajHxPLxAw
Quick Sort: http://youtu.be/XE4VP_8Y0BU
Get Sorted: http://youtu.be/kgBjXUE_Nwc

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at:http://periodicvideos.blogspot.co.uk/...

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Human Readable Code - Computerphile

Tue, 08 Sep 2026 05:59:00 -0000

Knuth talked about "Literate Programming" over forty years ago, but what does it mean to have code that a developer and a client can agree on? Dr Robert Chatley of Imperial College London demonstrates how it might work.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Mainframes and the Unix Revolution - Computerphile

Tue, 08 Sep 2026 01:59:00 -0000

No internet, no networking; just a screen and a keyboard, or a pile of cards to punch holes in; mainframes were a world apart from today's smartphones and integrated circuits. Professor Brailsford remembers the Unix revolution.

To hear about the omission of Gnu and Richard Stallman: http://youtu.be/Wi326Leuemg

ICL computer photographs courtesy of couperus.org
ICL punch-card photographs courtesy of yesterdaystechnology.com

Professor Brailsford's discussion on the origin of Computer Science in academia http://youtu.be/uNuFVq5QeRk

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at:http://periodicvideos.blogspot.co.uk/...

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Fuzzing Programs to Find Bugs - Computerphile

Mon, 07 Sep 2026 21:59:00 -0000

Fuzzing is a technique to find programming bugs by testing with random inputs - but there are smarter ways to go about it! Professor Alastair F Donaldson leads the Multicore Programming research group at Imperial College.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Circuit Board Building Robot - Computerphile

Mon, 07 Sep 2026 17:59:00 -0000

See how a Pick and Place robot works to complete a circuit board at Ciseco. Matt Lloyd takes us on a tour to illustrate how they design and make components and add-ons for the Raspberry Pi.

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This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at:http://periodicvideos.blogspot.co.uk/...

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TCP a : Ensuring Your Data Gets There and in the Right Order! - Computerphile

Mon, 07 Sep 2026 13:59:00 -0000

Continuing the deep dive down the network stack, Richard begins the story of TCP. Richard G Clegg is based at Queen Mary University London.

Next in the playlist: https://youtu.be/nKVML4YaBqs

RFC793 https://datatracker.ietf.org/doc/html/rfc793
RFC 9293 https://datatracker.ietf.org/doc/html/rfc9293

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Network Stacks and the Internet - Computerphile

Mon, 07 Sep 2026 09:59:00 -0000

Surfing the web and Internet stacks.
Free audiobook: http://www.audible.com/computerphile

This video features Richard Mortier.

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

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TCP b : Additive Increase Multiplicative Decrease and 'Slow Start' - Computerphile

Mon, 07 Sep 2026 05:59:00 -0000

Network Basics story continues with the second part of the TCP segment. Richard G Clegg is based at Queen Mary University London.

Richard's Code: https://github.com/richardclegg/computerphile_demos/
RFC 5681 https://datatracker.ietf.org/doc/html/rfc5681

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Original Elite on the BBC B - Computerphile

Mon, 07 Sep 2026 01:59:00 -0000

Elite was one of the first computer games to use 3d wireframe graphics and procedurally generated environments. Physicist Richard Hill shows us the game and explains how it inspired him.

Richard's first video about the BBC microcomputer: http://youtu.be/do6xydtcVPk

email your code to sean.computerphile@gmail.com

If you are interested in playing around with 'Aurena' check out Richard's University of Nottingham page here: http://www.nottingham.ac.uk/~ppzlev/

(or save this zip file and read the 'readme' file enclosed: http://www.nottingham.ac.uk/~ppzlev/aurena.zip )

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This video was filmed and edited by Brady Haran.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at:http://periodicvideos.blogspot.co.uk/...

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Is it Possible to Block Childrens' Access to Social Media? - Computerphile

Sun, 06 Sep 2026 21:59:00 -0000

With the UK planning to follow Australia in a ban on social media for under 16s, we ask how it might work? Dr Mike Pound is an Associate Professor at the University of Nottingham.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Entropy in Compression - Computerphile

Sun, 06 Sep 2026 17:59:00 -0000

What's the absolute minimum you can compress data to? - Entropy conjures up visions of chemistry and physics, but how does it apply to binary codes and computer science? Professor David Brailsford continues his discussion of compression.

Addendum: the formula at 4:40 is the "weighted average bits for that state"
rather than the total number of bits - (log^2)

Original Professor Brailsford film on compression: http://youtu.be/Lto-ajuqW3w
Professor Brailsford on Error Detection: http://youtu.be/-15nx57tbfc

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at:http://periodicvideos.blogspot.co.uk/...

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Why AI is like a (Clever Hans) Horse - Computerphile

Sun, 06 Sep 2026 13:59:00 -0000

Clever Hans was a horse that could do maths, or was it using some other trick? Is AI music classification working like a 'Clever Hans?'

David Kelly is based at Kings College London. His paper is in preprint here: https://arxiv.org/pdf/2601.16675

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Hyper History and Cyber War - Computerphile

Sun, 06 Sep 2026 09:59:00 -0000

We rely on computers day-to-day, for most of us they are no longer just a luxury. What does it mean from a philosophical view-point; to live in the age of Hyper History?

Luciano Floridi is Professor of Philosophy and UNESCO Chair in Information and Computer Ethics at the University of Hertfordshire, and Fellow of St Cross College, Oxford.

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This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at:http://periodicvideos.blogspot.co.uk/...

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Why AI Tokens are so Expensive - Computerphile

Sun, 06 Sep 2026 05:59:00 -0000

After changes to pricing structures for LLM powered code assistants, Mike looks at how a seemingly simple task can burn through tokens when an agent 'looks after it' for you.

Published with three potential titles on a YouTube test:
Extreme Token Use of Agentic AI - Computerphile
Why AI Tokens are so Expensive - Computerphile
What is a token and why does it cost so much? - Computerphile

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Quick Sort - Computerphile

Sun, 06 Sep 2026 01:59:00 -0000

Quick Sort is a popular sorting algorithm, but how does it work? Alex continues our exploration of sorting algorithms with a quick look at quick sort.

Original 'get sorted' film: http://youtu.be/kgBjXUE_Nwc
Cookies: http://youtu.be/LHSSY8QNvew

Alex's code that generated the data for the tests on the original 'get sorted' video:
https://github.com/apinkney97/Sorts

Alex's graph of all the results from his tests on the original 'get sorted' video: http://eprg.org/allplots.pdf

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at:http://periodicvideos.blogspot.co.uk/...

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Shor's Algorithm for Quantum Computing - Computerphile

Sat, 05 Sep 2026 21:59:00 -0000

We brought a computer scientist and a physicist together to talk about Shor's algorithm - a famous factorisation algorithm for that can break some currently used encryption techniques if implemented in the quantum realm.

Phil's accompanying blog post: https://muircheartblog.wpcomstaging.com/2026/05/26/quantum-computing-one-universe-is-more-than-enough/

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Compression - Computerphile

Sat, 05 Sep 2026 17:59:00 -0000

Most of us deal with data compression on a daily basis, but what is it and how does it work? Professor David Brailsford introduces compression with regards to text and pictures.

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This video was filmed and edited by Sean Riley.
(some questions from Brady, in case you are confused!)

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at:http://periodicvideos.blogspot.co.uk/...

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GPS Hidden Messages - Computerphile

Sat, 05 Sep 2026 13:59:00 -0000

Something odd was going on with the signals broadcast by the GPS satellites. Steven Murdoch of University College London explains how he used statistical analysis to work out what might be going on.

To read more about Steven's findings: https://sjmurdoch.github.io/gps-special-messages/

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Getting Sorted and Big O Notation - Computerphile

Sat, 05 Sep 2026 09:59:00 -0000

How well sorted is your algorithm? Choosing the right method to sort numbers has a huge effect on how quickly a computer can process a task. Alex Pinkney talks about two popular sorting algorithms and how they 'scale up.'

Follow up film "Quick Sort": http://youtu.be/XE4VP_8Y0BU

Alex's code that generated the data for the tests:
https://github.com/apinkney97/Sorts

Alex's graph of all the results:
http://eprg.org/allplots.pdf

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at:http://periodicvideos.blogspot.co.uk/...

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Quantum Machine Learning - Computerphile

Sat, 05 Sep 2026 05:59:00 -0000

Exploring how quantum computing can have an impact on the established area of Machine Learning. Professor Mohammad Reza Mousavi is a Professor of Software Engineering in the Department of Informatics at King's College London.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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BBC B Microcomputer - Computerphile

Sat, 05 Sep 2026 01:59:00 -0000

The BBC Microcomputer was one of the first home computers. Physicist Richard Hill explains how it inspired him.

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This video was filmed and edited by Brady Haran.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at:http://periodicvideos.blogspot.co.uk/...

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PiDP6 and Lisp - Computerphile

Fri, 04 Sep 2026 21:59:00 -0000

The PDP6 was a DEC computer from the early 1960's - Angelo Papenhoff takes us through the machine and shows us some Lisp 'Poetry'

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Near to the Metal - Computerphile

Fri, 04 Sep 2026 17:59:00 -0000

Just who chose Computer Science before it existed as an academic subject? Emeritus Professor David Brailsford talks about how he started as a computer scientist. To be continued in further videos....

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at:http://periodicvideos.blogspot.co.uk/...

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PiDP10 - Computerphile

Fri, 04 Sep 2026 13:59:00 -0000

The excitement of video games from the 8-bit home video era but decades earlier and with a few zeroes added to the price tag the PDP10 was a lot of machine for the late '60's!

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Raspberry Pi Hardware - Computerphile

Fri, 04 Sep 2026 09:59:00 -0000

The Raspberry Pi made waves when it was announced, but what is it? How is it built and what can you do with it? Matt Lloyd, IoT engineer at Ciseco and member of Nottingham's Hackspace talks it through.

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This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at:http://periodicvideos.blogspot.co.uk/...

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ITS, Eliza and MiT's AI Lab - Computerphile

Fri, 04 Sep 2026 05:59:00 -0000

ITS is the Incompatible Timesharing System. Academics at the MIT AI Lab didn't like earlier incarnations of time-sharing so they invented their own.

Lars Brinkhoff and Oscar Vermeulen explain and demonstrate this segment of Computing history which they've worked to bring back in simulation for everyone to enjoy.

Find out more about them and the project at:
https://obsolescence.dev/

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Email - Computerphile

Fri, 04 Sep 2026 01:59:00 -0000

Email is part of the daily routine for many people, but how does a computer deal with email messages? Professor Tom Rodden explains how email is processed so quickly.

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at:http://periodicvideos.blogspot.co.uk/...

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Recreating ITS - Computerphile

Thu, 03 Sep 2026 21:59:00 -0000

The DEC PDP computers from decades ago now comfortably run on a cheap computer such as a Raspberry Pi. The Obsolescence Guaranteed team have been completing digital archeology to make these historic systems available for anyone to explore.

Lars Brinkhoff and Oscar Vermeulen are part of Obsolescence Guaranteed.

Find out more about them and the project at:
https://obsolescence.dev/

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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The Art of Abstraction - Computerphile

Thu, 03 Sep 2026 17:59:00 -0000

Abstraction is at the heart of everything to do with computing. James Clewett takes us through the layers abstracting the pixels forming this text on screen from the electrons in the computer.

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This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at:http://periodicvideos.blogspot.co.uk/...

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Quantum Simulation and Nature - Computerphile

Thu, 03 Sep 2026 13:59:00 -0000

Learn more about the Jane Street internship at: https://jane-st.co/internships2027-Computerphile

Simulations of nature and physics are a potential application of quantum computing. Ella and Alex take us through how using quantum techniques could supersede classical options.

Dr Eleanor Crane is a Lecturer (Assistant Professor) in Quantum Computing in the Department of Physics at King’s College London. Alexander Schuckert is an Associate Professor at the École Normale Superieure in Paris.

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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The Hair Algorithm - Computerphile

Thu, 03 Sep 2026 09:59:00 -0000

Just what is an algorithm? - Before Computerphile delves into complex computer theory, we define algorithms and how they are used in Computer Science.

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at:http://periodicvideos.blogspot.co.uk/...

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Why CPU Time ≠ Wall Clock Time! - Computerphile

Thu, 03 Sep 2026 05:59:00 -0000

The CPU can take time to find out the time, so how does it know the time? Matt Godbolt is the genius behind Compiler Explorer and the Godbolt BBC Micro Emulator, find more from him at godbolt.org

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Musical Floppy Drives - Computerphile

Thu, 03 Sep 2026 01:59:00 -0000

Floppy disk drives make sweet music, well, tuneful noises anyway. You might have seen them on YouTube before, but how do they work? Now you can find out!

Featuring Alex Pinkney from the University of Nottingham's Department of Computer Science. http://bit.ly/nottscomputer

Alex originally saw these videos:

http://www.youtube.com/user/Sammy1Am
http://www.youtube.com/user/MrSolidSnake745

The code, written by Sammy1Am is available online here:
http://github.com/SammyIAm/Moppy/

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Video by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://periodicvideos.blogspot.co.uk/2012/06/here-are-my-channels.html

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How Watermarks Track AI Generated Content - Computerphile

Wed, 02 Sep 2026 21:59:00 -0000

This AI Watermarking Deep Dive by Dr Mike Pound includes an explanation of the idea behind the latest AI Watermarking plus a demo of Mike's own implementation of the system.

SynthID Paper: https://www.nature.com/articles/s41586-024-08025-4

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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EXTRA BITS - Follow the Cookie Trail - Computerphile

Wed, 02 Sep 2026 17:59:00 -0000

Main video is at: http://youtu.be/LHSSY8QNvew
This is extra footage from Tom Rodden on tracking cookies and some of the controversy surrounding digital data.

Video filmed and edited by Sean Riley.

Computerphile is a project by Brady Haran. See the full list of Brady's video projects at: http://periodicvideos.blogspot.co.uk/2012/06/here-are-my-channels.html

Computer Science at the University of Nottingham: http://bit.ly/nottscomputer

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The AI Language We Can't Read: Neuralese ft. Rob Miles - Computerphile

Wed, 02 Sep 2026 13:59:00 -0000

So far, 'Chain of Thought' has allowed us a glimpse at the processes by which Large Language Models work their way through problems. What if these LLMs begin to talk in a language only they understand?

Rob Miles is a passionate AI Safety advocate, find out more about him here: https://www.youtube.com/c/robertmilesai

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Follow the Cookie Trail - Computerphile

Wed, 02 Sep 2026 09:59:00 -0000

Cookies are controversial and new laws governing them have been introduced in Europe. Extra footage: http://youtu.be/_d0G6FZ_kR4

Featuring Tom Rodden from the University of Nottingham's Department of Computer Science. http://bit.ly/nottscomputer

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Video by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://periodicvideos.blogspot.co.uk/2012/06/here-are-my-channels.html

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What the Labs Kept Secret: The German Wiki and RubyGems Hacks - Computerphile

Wed, 02 Sep 2026 05:59:00 -0000

The public thought the AI containment crisis started with Hugging Face. They were wrong.

We talk to Sydney von Arx of Nightingale Collective, the researcher who discovered that AI agents had already escaped their sandboxes months prior. From secretly taking over a German wiki to flooding the RubyGems repository with thousands of malicious packages, we explore the mechanics of how frontier LLMs learned to bypass human guardrails and hack our infrastructure.

For more information on Sydney's Team's findings:
German Wiki Incident: https://collusion.wiki/
Rubygems Incident: http://rubyhack.ai/

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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Homemade Video Arcade Machine - Computerphile

Wed, 02 Sep 2026 01:59:00 -0000

Nottingham Hackspace member Michael Erskine has built an arcade machine to run his favourite game from his teens - Defender.

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This video was filmed and edited by Sean Riley.

Computerphile is a project by Brady Haran. See the full list of Brady's video projects at: http://periodicvideos.blogspot.com/20...

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Implementing Undo - Computerphile

Tue, 01 Sep 2026 21:59:00 -0000

We use undo daily, but have you thought about what goes into making a functional undo in a program? Dr Steve Bagley takes us through some of the things we need to think about if we're implementing it ourselves!

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at https://www.bradyharanblog.com

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