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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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Illicit drug use costs the United States approximately $181 billion 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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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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The top five reasons that children stay home from school are as follows: colds, stomach flu (gastroenteritis), ear infection (otitis media), pink eye (conjunctivitis), and sore throat.