This Temporary Tattoo Is Actually a Battery That's Powered By Your Sweat

What if the sweat produced by your body could power your gadgets? And what if the connection between the two could be made by a temporary tattoo, the more you sweat, the more power the tattoo generates? That's exactly what researchers at UC San Diego have developed—and one day, it could power your wearables. » 8/13/14 9:30am 8/13/14 9:30am