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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 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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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.