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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
The newest statin drug, rosuvastatin, has been called a superstatin because it appears to reduce LDL cholesterol to a greater degree than the other approved statin drugs.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.