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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.
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The horizontal fraction bar was introduced by the Arabs.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.