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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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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 longest a person has survived after a heart transplant is 24 years.
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Cyanide works by making the human body unable to use oxygen.
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On average, the stomach produces 2 L of hydrochloric acid per day.