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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 longest a person has survived after a heart transplant is 24 years.
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There are more bacteria in your mouth than there are people in the world.
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The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.
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According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.