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From Gunpowder to Teeth Whitener: The Science Behind Historic Uses of Urine | Surprising Science

http://blogs.smithsonianmag.com/science/2013/08/from-gunpowder-to-teeth-whitener-the-science-behind-historic-uses-of-urine/ Internet Archive
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Date added
Sept. 29, 2013, 9:35 p.m.