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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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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.
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Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.
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The average adult has about 21 square feet of skin.