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The horizontal fraction bar was introduced by the Arabs.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.
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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.