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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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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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When intravenous medications are involved in adverse drug events, their harmful effects may occur more rapidly, and be more severe than errors with oral medications. This is due to the direct administration into the bloodstream.
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Everyone has one nostril that is larger than the other.
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The horizontal fraction bar was introduced by the Arabs.