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Vaccines prevent between 2.5 and 4 million deaths every year.
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The horizontal fraction bar was introduced by the Arabs.
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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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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.