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.
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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.
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No drugs are available to relieve parathyroid disease. Parathyroid disease is caused by a parathyroid tumor, and it needs to be removed by surgery.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
How plant cells take up and transform nitrate
A mother and her pups in a suburban yard in late May
