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Illicit drug use costs the United States approximately $181 billion every year.
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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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There are more sensory neurons in the tongue than in any other part of the body.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.