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Engineers have been harvesting energy for centuries, first using water and windmills, then hydroelectric dams, solar panels, and geothermal plants. Now some engineers are following physicist Richard Feynman’s advice and thinking small. They are using tiny solar panels and thermoelectric generators to glean power from seemingly insignificant temperature differences, piezoelectric elements that convert small mechanical vibrations into power, and galvanics that only need moisture to create electricity.
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