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The average office desk has 400 times more bacteria on it than a toilet.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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There are 20 feet of blood vessels in each square inch of human skin.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.