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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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The toxic levels for lithium carbonate are close to the therapeutic levels. Signs of toxicity include fine hand tremor, polyuria, mild thirst, nausea, general discomfort, diarrhea, vomiting, drowsiness, muscular weakness, lack of coordination, ataxia, giddiness, tinnitus, and blurred vision.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.