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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.
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Limit intake of red meat and dairy products made with whole milk. Choose skim milk, low-fat or fat-free dairy products. Limit fried food. Use healthy oils when cooking.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.