As well as recharging these things with solar, hotels could hook their gym treadmills into the system and turn their guests into power-generating hamsters: http

As well as recharging these things with solar, hotels could hook their gym treadmills into the system and turn their guests into power-generating hamsters: http://www.californiafitness.com/sg/en/node/587 http://www.californiafitness.com/sg/en/node/587