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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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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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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.
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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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In 1864, the first barbiturate (barbituric acid) was synthesized.