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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The horizontal fraction bar was introduced by the Arabs.
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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
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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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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.