Sure to be a hit with the kids next summer: stickers that warn when you've had too much sun.
Round patches -- about the size of a quarter and wearable on clothing or skin -- have been designed by an Israeli scientist to change color when exposed to too much sunshine.
Called the Sticker, the patch will come in six protection levels, which you match to your skin type. According to developer Ori Faran, the disposable device measures total accumulated ultraviolet dosage absorbed by the body since the patch was attached, not just the amount of light to which it is currently being exposed.
Assuming you assess your skin type correctly, your Sticker should turn from blue to silver or from purple to yellow shortly before you reach the level of exposure that would cause a light sunburn, giving you time to find the shade.
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