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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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If you could remove all of your skin, it would weigh up to 5 pounds.
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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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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 familiar sounds of your heart are made by the heart's valves as they open and close.