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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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Excessive alcohol use costs the country approximately $235 billion every year.
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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.
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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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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.