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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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The familiar sounds of your heart are made by the heart's valves as they open and close.
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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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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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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.