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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.
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Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.