"which isn't even going to power my wristwatch" Not true, thermocouples can produces hundreds of watts, it 's all about the size of the thermocouple and the te

"which isn't even going to power my wristwatch" Not true, thermocouples can produces hundreds of watts, it 's all about the size of the thermocouple and the temperature difference used. See: http://en.wikipedia.org/wiki/Radioisotope_thermoelectric_generator http://en.wikipedia.org/wiki/Radioisotope_thermoelectric_gen...