Скачать или смотреть Here's what that number on every bottle of sunscreen you buy actually means

We all know we're supposed to wear sunscreen to protect our skin. But how does sunscreen work? What does SPF mean? Here's everything you need to know before you hit the beach this summer.
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Business Insider is the fastest growing business news site in the US. Our mission: to tell you all you need to know about the big world around you. The BI Video team focuses on technology, strategy and science with an emphasis on unique storytelling and data that appeals to the next generation of leaders – the digital generation.