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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.
In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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.
During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.