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An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.
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The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
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The average adult has about 21 square feet of skin.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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There are more nerve cells in one human brain than there are stars in the Milky Way.