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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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There are more nerve cells in one human brain than there are stars in the Milky Way.