The world is filled with heat, waste heat. Everywhere you look, everywhere you sit.
It's energy lying around for anyone to use, and this guy had long ago come up with a way to make a miniscule amount of energy from heat.
However, as usual with any technology that hasn't made it to the bigtime, its too expensive and produces too crappy an amount of anything.
However, thermoelectrics are making a comeback with polymers. That's plastics, which have the potential to convert heat differentials into electricity.
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