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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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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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Everyone has one nostril that is larger than the other.
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There are approximately 3 million unintended pregnancies in the United States each year.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).