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Recharge gadgets by breathing: Friday fun
If you don't mind a few wires peeking from under your jumper, this might be a cheap way to charge gadgets.
Made from old CDROM drives, it uses the motion of breathing to drive some gearing linked to a small generator.
The downside is that it doesn't actually generate that much electricity. According to Ecogeek, it will take around 24 hours to charge a mobile phone
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