One of the latest trends in powering green gadgets is to do it off the grid, with some form of kinetic or human-induced power. Nothing exemplifies this fad better than the YoGen Charger. Unlike solar-powered devices which can take half a day to charge your gadgets, the YoGen portable dynamo will charge them in about the same time as a wall outlet. And you only need a few minutes of tugging on a string to get it going. Charging your phone or mp3 player has n
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