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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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There are more sensory neurons in the tongue than in any other part of the body.
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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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Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.