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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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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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The horizontal fraction bar was introduced by the Arabs.