Remember the childhood hours of fun spent blasting your friends with neon-tinged water cannons? You can thank a NASA scientist for that. In 1982, Lonnie Johnson designed the Super Soaker. But that wasn't Johnson's only invention. The award-winning scientist came up with everything from the Nerf gun to a thermoelectric energy converter, and now he's got even bigger aims. Lonnie Johnson: we thank you for your contributions to humanity and our childhoods.