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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, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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Computer programs are available that crosscheck a new drug's possible trade name with all other trade names currently available. These programs detect dangerous similarities between names and alert the manufacturer of the drug.
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The human body produces and destroys 15 million blood cells every second.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.