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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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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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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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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.