The discussion of any type of equipment or transportation using human muscles, usually leg muscles with cranks and chains. This includes generators, mills, drills, presses, boats, planes, and land vehicles.
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Alternative Energy (78)
Alternative Fuels (16)
Battery Technology (4)
Biodiesel Fuel (27)
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Energy Conservation (25)
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Free Energy (9)
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Ocean Energy (7)
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Wind Energy (37)