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The longest a person has survived after a heart transplant is 24 years.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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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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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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Illicit drug use costs the United States approximately $181 billion every year.