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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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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
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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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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.