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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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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 60,000 miles of blood vessels in every adult human.
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Thyroid conditions may make getting pregnant impossible.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.