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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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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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There are 60,000 miles of blood vessels in every adult human.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.