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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
There are more sensory neurons in the tongue than in any other part of the body.
More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.
The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.