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Submit here only sites that produce energy "for free". Sites that describe energy production from unproven sources or extract it by unproven methods should go to the Science/Technology/Energy/Unproven_Concepts category.
Perpetual motion machines either produce more energy than is put into them or convert heat into other forms of energy without warming something cooler than the source of the heat. See http://en.wikipedia.org/wiki/Perpetual_motion_machine for a more detailed explanation.
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Last update: Tuesday, January 22, 2013 2:54:06 PM EST - edit