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.

All entrepreneurs have an aptitude for risk, but more important than that is their capacity for self-delusion. Indeed, psychological investigations have found that entrepreneurs aren’t more risk-tolerant than non-entrepreneurs. They just have an extraordinary ability to believe in their own visions, so much so that they think what they’re embarking on isn’t really that risky. They’re wrong, of course, but without the ability to be so wrong—to willfully ignore all those naysayers and all that evidence to the contrary—no one would possess the necessary audacity to start something radically new.

I have never met an entrepreneur who fits this model more than Elon Musk. All of the entrepreneurs I admire most—Musk, Jeff Bezos, Reed Hastings, Jack Dorsey, Sergey Brin and Larry Page, Bill Gates, Steve Jobs, and a few others—have sought not just to build great companies but to take on problems that really matter. Yet even in this class of universe-denters, Musk stands out. After cofounding a series of Internet companies, including PayPal, the South African transplant could simply have retired to enjoy his riches. Instead he decided to disrupt the most difficult-to-master industries in the world. At 41 he is reinventing the car with Tesla, which is building all-electric vehicles in a Detroit-scale factory. (Wired profiled this venture in issue 18.10.) He is transforming energy with SolarCity, a startup that leases solar-power systems to homeowners.

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