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: https://www.youtube.com/watch?v=0pncNKHj-Sc Opening up the Original Mac: https://www.youtube.com/watch?v=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