Numberphile covered it well: https://www.youtube.com/watch?v=NgbK43jB4rQ https://www.youtube.com/watch?v=NgbK43jB4rQ It's also got a lot of videos on other coo

Numberphile covered it well: https://www.youtube.com/watch?v=NgbK43jB4rQ https://www.youtube.com/watch?v=NgbK43jB4rQ It's also got a lot of videos on other cool math stuff.