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Did you know?
Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.
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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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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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The familiar sounds of your heart are made by the heart's valves as they open and close.