When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
Did you know?
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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There are more bacteria in your mouth than there are people in the world.
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Eating food that has been cooked with poppy seeds may cause you to fail a drug screening test, because the seeds contain enough opiate alkaloids to register as a positive.
THEMIS image of probable Mars cave entrances
Strawberry Image From a Scanning Electron Microscope