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Did you know?
Blood is approximately twice as thick as water because of the cells and other components found in it.
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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
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The average adult has about 21 square feet of skin.
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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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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.