Negative Binary Numbers - you may have heard of 'signed' numbers, but do you know how they work? Professor Brailsford explains not just how, but why we use the systems we do. Binary Addition: http://youtu.be/WN8i5cwjkSE Most Difficult Program to Compute?: http://youtu.be/i7sm9dzFtEI Floating Point Numbers: http://youtu.be/PZRI1IfStY0 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. More at http://www.bradyharan.com