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The horizontal fraction bar was introduced by the Arabs.
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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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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.