Howstuffworks "How Sunburn and Sun Tans Work"
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There is something mysterious about the sun and skin. Why is it that if you go
out on a bright summer day and spend an hour in the sun, you get a sunburn? You get a
sunburn, that is, unless you happen to have taken the time to get a gradual tan.
With a tan you can go out in the sun and nothing happens. Of course, that
doesn't apply if you have "fair skin." The fair skinned among us never get a
tan, so they always get sunburned. Unless of course they are wearing a
sunscreen...
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