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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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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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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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Everyone has one nostril that is larger than the other.
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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.