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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 familiar sounds of your heart are made by the heart's valves as they open and close.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.