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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
The liver is the only organ that has the ability to regenerate itself after certain types of damage. As much as 25% of the liver can be removed, and it will still regenerate back to its original shape and size. However, the liver cannot regenerate after severe damage caused by alcohol.
It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.