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Did you know?
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 more sensory neurons in the tongue than in any other part of the body.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.