In this March 9, 2013, file photo, Electric car maker Tesla’s CEO Elon Musk gives the opening keynote at the SXSW Interactive Festival in Austin, Texas. Musk has admitted in a wide-ranging interview with The New York Times that stress is taking a heavy toll in what he calls an “excruciating year.” In the newspaper’s account of the interview, published Friday, Musk said he was working up to 120 hours a week and sometimes takes Ambien to get to sleep. (AP Photo/Jack Plunkett, File)
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