Scott Manley spends a lot of his spare time playing with little green people -- that is, the famous astronauts of the "Kerbal Space Program" computer game.
This makes the Silicon Valley techie very similar to others in his neighborhood, except for a crucial twist: Manley has an academic background in astrophysics, and he uploads his playing sessions to a YouTube channel with more than 500,000 subscribers.
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He calls himself the "Astronogamer" and profiles all sorts of games on his channel, from the classic Kerbal to the brand-new No Man's Sky. And while playing, he muses aloud about the science he sees, educating his viewers as he plays.
"Kerbal gets me continual traction for all sorts of crazy things," Manley said. "I can do straight up pure science, how to build aircraft, how to keep your rockets balanced as the fuel burns down. Or let's take a nuclear submarine and see what it takes to fly."