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There are more sensory neurons in the tongue than in any other part of the body.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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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Thyroid conditions may make getting pregnant impossible.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.