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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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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.

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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.

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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.

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There are more nerve cells in one human brain than there are stars in the Milky Way.

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