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LOS ANGELES — A day in the sun often means slathering on sunscreen to stave off sunburns — but it can be a guessing game as to when SPF coverage is starting to dwindle.

Now, scientists are working to develop a stick-on patch that can tell wearers when they’ve had too much time in the sun.


“We wanted to make something that could monitor UV exposure at the beach,” said Andrea Armani, a University of Southern California professor of electrical engineering who created the patch.

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