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The average adult has about 21 square feet of skin.
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Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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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.