Tiny chip inserted in the sole of a shoe can charge the wearer’s cell phone

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The ubiquity of cell phones has inspired countless creative ways to keep them charged, whether it’s through a pedal-powered table, a charging handbag or a USB-equipped urban bicycle — to name just a few recent examples. The latest spotting? A tiny chip insertable in the sole of any shoe that gathers and stores energy as the wearer walks.

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