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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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Asthma cases in Americans are about 75% higher today than they were in 1980.
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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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There are 20 feet of blood vessels in each square inch of human skin.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.