Electronic tattoo tracks the heat running through your veins

Thermometers don’t seem like they need reinventing. Just stick one beneath your tongue, wait a minute, and everything you need to know is right in front of you. But there’s a lot more that temperature can tell us if we’re paying close attention. “Normally on temperature, I’d think that’s not very interesting,” John Rogers, a University of Illinois researcher, tells The Verge. “It turns out, measuring skin temperature, let’s say to a tenth of a degree … that says something very meaningful about your physiological status and health.”

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