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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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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.

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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

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The oldest recorded age was 122. Madame Jeanne Calment was born in France in 1875 and died in 1997. She was a vegetarian and loved olive oil, port wine, and chocolate.

President-elect Barack Obama, his daughters, and wife, Michelle, celebrate his victory in November 2 President-elect Barack Obama, his daughters, and wife, Michelle, celebrate his victory in November 2
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Video: Miller's reaction chamber experiment Animation

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