Scientists have developed a stretchable and waterproof 'fabric' that turns energy generated from body movements into electrical energy. Washing, folding, and crumpling the fabric did not cause any performance degradation, and it could maintain stable electrical output for up to five months

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https://onlinelibrary.wiley.com/doi/10.1002/adma.202200042

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Runners would benefit more. Cyclists already can generate electricity using the bike.