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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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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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If you could remove all of your skin, it would weigh up to 5 pounds.
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Less than one of every three adults with high LDL cholesterol has the condition under control. Only 48.1% with the condition are being treated for it.