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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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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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Cyanide works by making the human body unable to use oxygen.
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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.