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There are 20 feet of blood vessels in each square inch of human skin.
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Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.
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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 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.