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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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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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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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Cyanide works by making the human body unable to use oxygen.
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The average adult has about 21 square feet of skin.