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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
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Approximately 25% of all reported medication errors result from some kind of name confusion.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.