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The human body produces and destroys 15 million blood cells every second.
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The horizontal fraction bar was introduced by the Arabs.
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Illicit drug use costs the United States approximately $181 billion every year.
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The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.
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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.