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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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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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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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Cucumber slices relieve headaches by tightening blood vessels, reducing blood flow to the area, and relieving pressure.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.