Elon Musk, founder of SpaceX, Tesla Motors and Hyperloop, has some serious reservations about artificial intelligence. And just as his inventions sound like something out of a sci-fi novel, so do his fears about AI: He worries that we risk unintentionally creating a super-smart machine that could obliterate humanity. One reason Musk is so eager to colonize other planets, in fact, is that he fears AI will wipe out the human race. We need a place to which to flee, he argues, even if it’s Mars.

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