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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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There are 20 feet of blood vessels in each square inch of human 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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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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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.