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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.
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People about to have surgery must tell their health care providers about all supplements they take.
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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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Fewer than 10% of babies are born on their exact due dates, 50% are born within 1 week of the due date, and 90% are born within 2 weeks of the date.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.