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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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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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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.