Video: Stephen Hawking hits zero g

X Prize founder Peter Diamandis talks about how he helped Stephen Hawking fulfill his dream of going to space -- by flying together into the upper atmosphere and experiencing weightlessness at zero g.

Peter Diamandis runs the X Prize Foundation, which gives rich cash awards to the inventors and engineers who'll get us back to the moon, build a better car and explore the genome. And watch for more prizes to come.