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The horizontal fraction bar was introduced by the Arabs.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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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.