German researchers are the ones that discovered a new source of energy. Using body heat to power up your favorite gadgets would be a good replacement to battery chargers. But, it is not that powerful yet and for now only small things can run on its energy yet.

The researchers say that they have designed "entire electronic systems" that can be powered by body heat electricity. On the picture they show that a wireless transmitter works on body heat energy and transfers data to the laptop. However, it only needs 200 millivolts to work. So I imagine how weak those systems that they have developed are.

If the size of thermoelectric generator used to convert heat into electricity is small enough it can be built in clothing for example. A man's back surface will generate much more heat than its hand so that would be a pretty good way to use the new source of electricity. It might be enough to power up color changing glasses, or some small things like your watch, only they will stop functioning each time you take them off.

They still have ways to go in order to make our bodies able to power up cell phones, portable video games, and video players.