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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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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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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.
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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.