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The average adult has about 21 square feet of skin.
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The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.
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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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More than 4.4billion prescriptions were dispensed within the United States in 2016.
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The human body produces and destroys 15 million blood cells every second.