Usain Bolt won gold in the 100m sprint at the London Olympics, clocking 9.63 seconds… but Albert Einstein has something to say about all this? Featuring Tony Padilla – twitter.com Website: www.numberphile.com Numberphile on Facebook: www.facebook.com Numberphile tweets: twitter.com Videos by Brady Haran Brady’s other channels include: www.youtube.com (Chemistry stuff) www.youtube.com (Physics and astronomy) www.youtube.com (Space stuff) www.youtube.com (Science and behind the scenes) www.youtube.com (Food science) www.youtube.com (Big science facilities) www.youtube.com (Favourite scientists) www.youtube.com (Academic look at the Bible) www.youtube.com (Modern language and culture) www.youtube.com (Philosophy stuff)