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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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Blood is approximately twice as thick as water because of the cells and other components found in it.
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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.