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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
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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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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.