Swedish designer Peter Thuvander has thought up one of the most interesting gadget charger designs I've seen in awhile. The iYo Yo Yo is—you guessed it—a yo-yo that charges electronic devices. The yo-yo, which is still only in the concept phase, stores energy in a lithium-ion battery which can be used to charge your iPod or iPhone.
If the iYo ever does end up on the market, it would be a great way to get kids (or adults) to inadvertently produce energy as a byproduct of having fun.



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