By Sarah Parsons
Posted 05.13.2011 at 11:44 am 0 Comments
Hydrogen fuel cells have exploded onto the market as convenient chargers for your handheld devices. Plugged in via USB ports, the cells don't have to rely on wind or sun to stave off irritating "battery low!" messages.
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.