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Imagine betting nearly all your savings on a future you can't see yet. That was the risk behind Elon Musk's rise-not a smooth climb. And no, he didn't sell a video game as a baby; he was 12, and got $500. His first company, Zip2, sold for $307 million. His next company became PayPal, the online payments service. eBay bought it for $1.5 billion; Musk got $180 million. Then he put most of that money into the future: $100 million in SpaceX, his rocket company, and $70 million in Tesla, the electric-car maker. The bet stopped looking bold. SpaceX's first three launches failed. Tesla was weeks from bankruptcy. Then SpaceX's fourth launch succeeded, while Tesla got emergency funding at the end of 2008. They survived. Later growth drove Musk's wealth to the top. His rise came after the brink, not before.