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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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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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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.