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The average adult has about 21 square feet of skin.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.
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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.