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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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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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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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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.