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WASHINGTON, July 26, 2016 � When we go outside, we expose ourselves to the most common carcinogen of all: ultraviolet (UV) rays in sunlight. Most of us know we should apply sunscreen to protect our skin, but some of us forget and suffer a flaky, irritated sunburn in return. In this week’s Reactions, we highlight the chemistry behind UV radiation, melanin and sunburns. See the video here: .

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