The billionaire genius who Tony Stark is based on wants humans on Mars within 15 years
The world knows him as Elon Musk — co-creator of PayPal, founder of Tesla motor sports, and CEO of SpaceX, the first private company in history to send a spacecraft to the International Space Station. But according to director Jon Favreau, Musk also served as an inspiration for billionaire-genius Tony Stark, of the Iron Man…