Alex Goldmark reports on one designer's plans for a cell phone that could charge from any heat source, including your pocket:
[Designer Patrick Hyland]'s put a thermogenerator inside the phone that converts heat into electric potential energy. To better conduct the heat to that little power plant in your pocket, the E-Cu (E for energy, Cu for copper) is encased in copper backing with engraved heat sinks like those normally used to keep electronics from overheating.
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