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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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The human body produces and destroys 15 million blood cells every second.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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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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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).