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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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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.