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Medication errors are three times higher among children and infants than with adults.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.
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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 immune system needs 9.5 hours of sleep in total darkness to recharge completely.