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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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Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.
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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.