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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.