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Did you know?
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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There are approximately 3 million unintended pregnancies in the United States each year.
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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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There are more nerve cells in one human brain than there are stars in the Milky Way.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.