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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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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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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.