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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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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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In the United States, congenital cytomegalovirus causes one child to become disabled almost every hour. CMV is the leading preventable viral cause of development disability in newborns. These disabilities include hearing or vision loss, and cerebral palsy.
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Illicit drug use costs the United States approximately $181 billion every year.
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The horizontal fraction bar was introduced by the Arabs.