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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
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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 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.