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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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There are approximately 3 million unintended pregnancies in the United States each year.
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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.
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The horizontal fraction bar was introduced by the Arabs.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%