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A 3-Inch-Thick Coating Of Zinc Oxide Ought To Be Just About Enough
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New research says you're not putting on enough sunscreen, and thus are only getting 40% of what you should be getting. Solution: Put it on thicker, or use a higher SPF. But remember, other research says that anything above, say, SPF 50 is bogus. So put it on thicker. (The Guardian)
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