Power patch

Out of juice? Here's a patch that uses sweat to power batteries.
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We all perspire, and yes, that’s a good thing, no matter how smelly we get. It’s our bodies’ natural way of keeping us cool, and now it can be useful in other ways, such as charging and powering devices. Researchers at the University of California, San Diego, have come up with this neat little temporary tattoo-style sticker that can both measure a person’s lactate, a chemical released in sweat (and which can be used to test for heart and lung disease), and potentially power wearables. A sensor in the tattoo strips electrons from the lactate in order to create an electrical current, and that is then stored in the patch to be used to power small devices, such as a watch and hopefully one day, a phone. We predict sales of deodorant brands sky-rocketing if this little contraption is a success.