A knee brace that generates enough electricity to power 10 cellphones was demonstrated by scientists recently. The brace harvests the energy of a person's knee braking after taking a step, similar to the way hybrid car brakes collect energy to charge their batteries. The device only weighs 3.5 pounds, and does not need the intense effort that other human-powered energy generators such as hand cranks require. And while the cellphone measurement given by the creators is pretty useless, they do have several practical applications in mind.
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http://gizmodo.com/354097/knee-brace-charges-your-cellphone
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