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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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Liver spots have nothing whatsoever to do with the liver. They are a type of freckles commonly seen in older adults who have been out in the sun without sufficient sunscreen.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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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.