PARIS: Out at sea, gentle waves provide power for thousands of homes. In cities, dancefloor moves generate electricity for nightclubs. In the countryside, hikers use leg power to recharge their phones.

It is an alluring goal of clean, reliable power free from geo-political risks—and scientists in the United States said on Tuesday (Wednesday in Manila) it lies within reach, thanks to a smart way to harvest energy called tribo-electricity.

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