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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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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
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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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The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.