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Use nano-generators to produce electricity from heat

I remember seeing on television that someone made generators the size of molecules. I am not sure if it is possible, but perhaps if a generator could be made the size of a molecule, it could be spun by the collisions of other molecules, which is what heat really is. This might allow it to convert heat into electricity without a temperature difference, which could allow air conditioners to produce electricity rather than use it.

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    Jul 30 2012: There are already devices that can produce electricity from heat. There called thermocouples. Thermocouples are what NASA uses in Radioisotope Thermoelectric Generators which use that natural heat of radioactive decay to produce electricity. They can run at full power for as long as the half life of the radioisotope being used which is normally Pu239 which has a half life of 24,000 years.