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: https://www.youtube.com/watch?v=L6bDA5FK6gs Floating Point Numbers: https://www.youtube.com/watch?v=PZRI1IfStY0 The VR Cave: https://www.youtube.com/watch?v=STMcWUtQr1Y Busy Beaver Turing Machines: https://www.youtube.com/watch?v=CE8UhcyJS0I nb: the prefixes that Dr Mortier did in his head should actually have been 128.243.128/24 and 128.243.0/24 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