Steffen's Polyhedron(gregegan.net)
56 points by pavel_lishin | 5 comments
56 points by pavel_lishin | 5 comments
456 points by jxmorris12 | 54 comments
A 1966 letter from Richard Feynman to former student Koichi Mano advising him that worthwhile problems are ones you can actually solve, hosted on cat-v.org.
60 points by gone35 | 1 comments