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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.
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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.