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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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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.
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There are more bacteria in your mouth than there are people in the world.
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Medication errors are more common among seriously ill patients than with those with minor conditions.
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Blood is approximately twice as thick as water because of the cells and other components found in it.