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Thyroid conditions may make getting pregnant impossible.
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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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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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The human body produces and destroys 15 million blood cells every second.