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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
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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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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.