Far-Out Green Gadgets

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People-powered music player

Christian Karlsson of Norway scored an honourable mention in the Greener Gadgets competition with his concept for the RollOn MP3 player, a device that the user powers by rolling the charging wheel (shown above) in between two hands or on a flat surface such as a table. Karlsson says that he was inspired by old-fashioned dynamo-powered lights for bicycles.

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