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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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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.