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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.
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The horizontal fraction bar was introduced by the Arabs.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%