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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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Excessive alcohol use costs the country approximately $235 billion every year.
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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
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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.