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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On average, the stomach produces 2 L of hydrochloric acid per day.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.