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The horizontal fraction bar was introduced by the Arabs.
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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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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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ACTH levels are normally highest in the early morning (between 6 and 8 A.M.) and lowest in the evening (between 6 and 11 P.M.). Therefore, a doctor who suspects abnormal levels looks for low ACTH in the morning and high ACTH in the evening.