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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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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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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.