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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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The average adult has about 21 square feet of skin.
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People often find it difficult to accept the idea that bacteria can be beneficial and improve health. Lactic acid bacteria are good, and when eaten, these bacteria improve health and increase longevity. These bacteria included in foods such as yogurt.