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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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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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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.