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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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The human body produces and destroys 15 million blood cells every second.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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If you could remove all of your skin, it would weigh up to 5 pounds.
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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.