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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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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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There are more sensory neurons in the tongue than in any other part of the body.
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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.