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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.
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Cyanide works by making the human body unable to use oxygen.
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Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.