Jawbone's 15-gram earpiece/boom is spring loaded to seat the voice sensor against your cheek. A port in the stainless-steel casing allows one mic to detect background noise. A belt clip houses the processor, which analyzes three streams of data 500 times a second to identify noise.
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.