Mechanical engineers at the University of Wisconsin–Madison have developed a shoe sole with an embedded energy harvester that can charge mobile electronics on-the-go. “Human walking carries a lot of energy,” said professor Tom Krupenkin. “Theoretical estimates show that it can produce up to 10 watts per shoe, and that energy is just wasted as heat. A total of 20 watts from walking is not a small thing, especially compared to the power requirements of the majority of modern mobile devices.” Pretty soon, you’ll never run out of battery again. At least as long as you keep moving.
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