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How Does Sunscreen Shield Your Skin With Science?

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Wired reports on the science behind one of our most productive summer rituals:

“It’s just physics and chemistry, essentially,” says Dr. Steve Wang, head of dermatology at the Memorial Sloan Kettering Cancer Center in New York City. Ultraviolet radiation from the sun hits your skin at wavelengths ranging from 290 to 400 nanometers. This span includes both UVA and UVB radiation, though it’s the UVBs—with wavelengths ranging from 290 to 320 nanometers—that are the bigger threat.

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