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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 nerve cells in one human brain than there are stars in the Milky Way.
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The human body produces and destroys 15 million blood cells every second.
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According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.