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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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There are more bacteria in your mouth than there are people in the world.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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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.