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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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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.