BRADY HARAN: I want to deal with a number that must be the most requested so far on Numberphile, and that is 301. Now, for those of you who don't pay much attention to the YouTube view counters, you...
Lower the PYRAMID. And now the CONE. Good job! We need a CUBE and a CUBOID for our foundation. Oh, hi! Look, we are building a giant roller coaster. Do you want to help us? Here comes Benny with...