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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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Vaccines prevent between 2.5 and 4 million deaths every year.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.
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Blood is approximately twice as thick as water because of the cells and other components found in it.