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There are 60,000 miles of blood vessels in every adult human.
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The average adult has about 21 square feet of skin.
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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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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Approximately 25% of all reported medication errors result from some kind of name confusion.