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I've always wanted to connect a horse to some wheels via a crankshaft or two, but I guess horses can't be taught to pedal. What a shame, because a man goes three times as fast on a bike than on foot, so imagine how fast a horsebike might go.
I'd like to see a muscle, supported by an artificial heart+lung+kidneys, grafted to a machine to be used as a source of power. Just add sugar and O2, and it gives off CO2 and H2O. But would it be more efficient than a combustion engine or a solar-electric arrangement?
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