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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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 Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.