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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.
Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
Cyanide works by making the human body unable to use oxygen.
About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.