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electricity

Knee Brace Charges Your Cellphone

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. More »

10:48 PM on Thu Feb 7 2008
By Benny Goldman
25,822 views, 19 comments

Latest by ANoel: hey... howabout a combo cigarette holder/lighter with an embeded whizzer propellor that charges the unit with evey puff, saving tons of propane every year!Additionally with non-tobacco sources you could reverse it for a puff-powered cannon. more »