The VAMP iPhone amplifier doubles listening time while improving the quality of compressed audio. Users connect the lithium-ion-powered case to an iPhone 4 or 4S’s 30-pin port. The system processes digital audio files to sound more like the original recordings. V-Moda VAMP$650
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.