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There are 20 feet of blood vessels in each square inch of human skin.
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Everyone has one nostril that is larger than the other.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.