The Bottle Lock frees bikers from bulky U-locks and clanking chains. The five-foot plastic-coated steel cable coils inside a bottle that rests in a standard frame-mounted cage. It reels out of the bottle, wraps around the bike frame, and locks back into itself.
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.