021 = Inharmonics and Skin-harm-tonics
A Problem Squared
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The SPF Rating for a Sunscreen?
SPF is the fraction of UV light that makes it through. Some people will say it's how much longer you can stay in the sun. In terms of compliance, like the SPF is like the best case. But it's never going to be quite that good. Can you get that with blocks or the absorbing types? It's the same.
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