SpaceX transferred friction stir welding techniques and equipment to Tesla Motors according to Ashlee Vance, a Bloomberg journalist who recently published a book about Elon Musk. Musk, CEO of both Tesla and SpaceX, often speaks of the difficulties of running two companies, but he also acknowledged some advantages of being active in two different industries. SpaceX aims at dramatically reducing the cost of rockets and if there’s an industry who mastered the art of making complex vehicles cheap, it’s certainly the automotive industry.

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