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New nanogenerators offer 140x power density, could replace solar cells
(interestingengineering.com)
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Big, big if. It says nothing about the actual manufacturing process. Also, the kind of movements smart watches make are large enough I'm guessing a balance of some kind already can capture a lot of it, if you don't mind the feeling of having weights on your wrist.
Like most science press releases I'm not holding my breath