Wednesday, December 11, 2019
From Gunpowder to Teeth Whitener: The Science Behind Historic Uses of Urine
Read more: https://www.smithsonianmag.com/science-nature/from-gunpowder-to-teeth-whitener-the-science-behind-historic-uses-of-urine-442390/#LiWGMqpsEUWxPZz1.99 Give the gift of Smithsonian magazine for only $12! http://bit.ly/1cGUiGv Follow us: @SmithsonianMag on Twitter
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