You know how much fun it is to break off the opener tab of a soda can and drop it into the can once you're done with the soda? (So much fun!) Well, two Spanish engineers have taken that experience one step further. Their DAlH2Orean remote-controlled car runs on a combination of recycled aluminum soda can tabs and sodium hydroxide, creating a zero-emissions hydrogen vehicle.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.