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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
Most women experience menopause in their 50s. However, in 1994, an Italian woman gave birth to a baby boy when she was 61 years old.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.