Suppose you have a ball covered entirely with hair and you're trying to comb the hair so that it lies flat everywhere along the surface. If the ball were a donut, or it existed in two...
JAMES GRIME: Today, we're going to talk about one of the questions that we get sent in a lot at Numberphile, and the question is-- well, Brady, what's the question? BRADY HARAN: The...
JAMES GRIME: Well, we're going to talk about illegal numbers. And when I heard that there were these things, illegal numbers, that some numbers were illegal, I was shocked and surprised as well....