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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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Cyanide works by making the human body unable to use oxygen.
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Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.