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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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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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The longest a person has survived after a heart transplant is 24 years.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.