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Elon Musk, CEO of Tesla, unveils the dual engine chassis of the new Tesla 'D' model at the Hawthorne Airport October 09, 2014 in Hawthorne, California. - 

Musk is CEO of SpaceX and Tesla, with an interest on the side in getting people to Mars. Last week, we headed to the Tesla factory in Fremont, California for a chat with Musk about battery technology and the future of global transportation.



Follow Kai Ryssdal at @kairyssdal