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Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.
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There are more bacteria in your mouth than there are people in the world.
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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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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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There are approximately 3 million unintended pregnancies in the United States each year.