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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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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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If you could remove all of your skin, it would weigh up to 5 pounds.