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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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Medication errors are three times higher among children and infants than with adults.
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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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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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Asthma cases in Americans are about 75% higher today than they were in 1980.