For the first time ever, NASA has been relying on private companies like Elon Musk's SpaceX for re-supply missions; only that's just the beginning. This QuickTake examines the future of space tourism using private space taxis. FILE - In this Tuesday, July 26, 2016, file photo, Elon Musk, CEO of Tesla Motors Inc., left, discusses the company's new Gigafactory in Sparks, Nev. On Wednesday, Aug. 3, 2016, Tesla reports financial results. SAN FRANCISCO - Elon Musk is gleefully pushing the technological envelope in the arenas of rocketry, transportation and solar energy.

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FILE - In this Tuesday, July 26, 2016, file photo, Elon Musk, CEO of Tesla Motors Inc., left, discusses the company's new Gigafactory in Sparks, Nev. On Wednesday, Aug. 3, 2016, Tesla reports financial results. SAN FRANCISCO - Elon Musk is gleefully pushing the technological envelope in the arenas of rocketry, transportation and solar energy. But when it comes to much-hyped and coming promise of artificially intelligent machines, the man at the helm of Tesla, SpaceX and SolarCity has deep concerns. In a video clip released Wednesday to Fortune magazine from German documentarian Werner Herzog's upcoming film about the Internet, Lo and Behold: Reveries of the Connected World (premiering Aug. 19), Musk is subdued as he explains how AI could pose a significant threat even if such technology isn't in the hands of dictators and criminals.