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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
In 1864, the first barbiturate (barbituric acid) was synthesized.
About 60% of newborn infants in the United States are jaundiced; that is, they look yellow. Kernicterus is a form of brain damage caused by excessive jaundice. When babies begin to be affected by excessive jaundice and begin to have brain damage, they become excessively lethargic.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.