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The horizontal fraction bar was introduced by the Arabs.
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Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
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On average, the stomach produces 2 L of hydrochloric acid per day.