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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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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.
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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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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.