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There are 20 feet of blood vessels in each square inch of human skin.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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To combat osteoporosis, changes in lifestyle and diet are recommended. At-risk patients should include 1,200 to 1,500 mg of calcium daily either via dietary means or with supplements.
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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.