Sunburns can be painful, and that's why physicians recommend using sunscreen to prevent sunburn from overexposure to the UV radiation of the sun. See how sunburn and sunscreen work in this...
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Sunburns can be painful, and that's why physicians recommend using sunscreen to prevent sunburn from overexposure to the UV radiation of the sun. See how sunburn and sunscreen work in this HowStuffWorks video.
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