Allen & Co. Media And Technology Conference [Getty Images]

Elon Musk, chairman and chief executive officer of Tesla Motors Inc., walks the grounds after a morning session during the Allen & Co. Media and Technology Conference in Sun Valley, Idaho, U.S., on Wednesday, July 8, 2015. Billionaires, chief executive officers, and leaders from the technology, media, and finance industries gather this week at the Idaho mountain resort conference hosted by investment banking firm Allen & Co. Photographer: David Paul Morris/Bloomberg via Getty Images

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