If there's a gene for entrepreneurship, Elon Musk has it. From his first project at age 12 creating and selling a videogame called Blastar for $500, to his $1-billion-plus sale of PayPal to eBay in 2002, the 37-year-old South African is every bit the born mogul. These days he's chairman of Solar City, the largest residential solar-power provider in California. He's also the founder and CEO of Space X, a space-exploration company that made headlines last September when it launched the first privately developed rocket into orbit. But lately it's Musk's newly minted role as CEO of the San Carlos, California-based start-up Tesla Motors that is drawing the most attention.