Do you remember how humans were grown and used as an energy source for the machines in the Matrix movies? Well, this kind of concept is probably being incorporated with charging your mobile phone
. The Dyson Energy Bracelet is a gadget that you strap on your wrist to harness energy from the hot and cold differences in your temperature. Once fully charged, you can connect a phone and charge it on the go. It's a pretty neat concept that implements the Seebeck, Peltier, and Thomson effect. Basically the temperature difference between the surface of the gadget that touches your skin and the ambient air allows to produce electricity and stored in a battery. And using the microUSB port, you'll be able to charge your phone. Sure it's a green way of doing it, but we just can't help think about those machines feeding off humans for energy.
source: Yanko Design