When a man tells you about the time he planned to put a vegetable garden on Mars, you worry about his mental state. But if that same man has since launched multiple rockets that are actually capable of reaching Mars -- sending them into orbit, Bond-style, from a tiny island in the Pacific -- you need to find another diagnosis. That's the thing about extreme entrepreneurialism: there's a fine line between madness and genius, and you need a little bit of both to really change the world.