The idea of an 800 mph transportation system is just the latest idea from the mind of Elon Musk.

Musk is a 42-year-old engineer who co-founded PayPal and created Space Exploration Technologies (SpaceX), a private space exploration company, and Tesla Motors, an American electric car company that produces the acclaimed Tesla S model.

Musk is also chairman of SolarCity, a company he cofounded "to help combat global warming and minimize air pollution," according to his website.

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Ultralong 84-month loans make new cars look budget-friendly. The real price shows up in interest and negative equity. (David Guralnick/The Detroit News/TNS)

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Waymo autonomous vehicles operate across 65 square miles inside I-285 and have been involved in six incidents with Atlanta Public School buses since May. Waymo issued a recall because of their cars briefly stopping or slowing down before continuing forward while a bus was stopped and flashing its lights. (Courtesy of Atlanta Public Schools)

Credit: Courtesy of Atlanta Public Schools