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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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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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The horizontal fraction bar was introduced by the Arabs.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.