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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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By definition, when a medication is administered intravenously, its bioavailability is 100%.

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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.

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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.

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