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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.
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There are more sensory neurons in the tongue than in any other part of the body.
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Illicit drug use costs the United States approximately $181 billion every year.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).