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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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The training of an anesthesiologist typically requires four years of college, 4 years of medical school, 1 year of internship, and 3 years of residency.
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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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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.