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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.
Although not all of the following muscle groups are commonly used, intramuscular injections may be given into the abdominals, biceps, calves, deltoids, gluteals, laterals, pectorals, quadriceps, trapezoids, and triceps.
Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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.
Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.