This Tiny Thumbnail Sensor Tells You When to Get Off the Beach Because You've Had Too Much Sun
As an adult, my mom is rarely around to remind me to reapply sunscreen when I’m outside. But do you know who still nags me all day long? My smartphone. So L’Oréal has created an incredibly tiny UV sensor you wear on your thumbnail that connects to your smartphone to help you keep track of your exposure to the sun’s…
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