The easiest way to know how long you can stay in the sun without getting burned.
| | | Science | | What Does Sunscreen SPF Really Mean? | | SPF (Sun Protection Factor) is a multiplication factor you can use to determine how long you can stay out in the sun before getting a sunburn. Here's how to calculate it for yourself. | | | | | | | |  | | READ THESE | | | | | | | | | | | | | | You are receiving this newsletter because you subscribed to the Today I Learned newsletter.
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