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The horizontal fraction bar was introduced by the Arabs.
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Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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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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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.