I had a feeling this would happen, Elon is a big fan of the WaitButWhy blog and often references it in his tweets. Also this is easily the most interesting interview with Elon. Most of them just scratch the surface and ask the same boring questions.

Fascinating. Well worth the read.

Also, per one of the asides, the Tesla factory is nuts: https://www.youtube.com/watch?v=8_lfxPI5ObM