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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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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.