In the future, your workout—or your workout gear, to be precise—might generate enough energy to charge your activity tracker. Researchers from the University of Texas at Dallas and South Korea’s Hanyang University (among other institutions) have figured out that by twisting carbon nanotubes into yarn, forming what they call a “twistron harvester,” they can harness mechanical energy and turn it into electricity. They published their results this week in the journal Science.

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