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This DIY USB Charger Powers Your iPhone While You Bike

We all know that we exert energy while doing exercise, and riding a bicycle is no exception. We also know that electricity can be generated by spinning a turbine with the power of wind or the rush of falling water -- so why can't electric power be produced by the spinning of a "turbine" when [...]

August 24, 2012
5:59 PM EDT
Photo: Doug Costlow
Photo: Doug Costlow
Photo: Doug Costlow
Photo: Doug Costlow