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There are more sensory neurons in the tongue than in any other part of the body.
The average office desk has 400 times more bacteria on it than a toilet.
On average, the stomach produces 2 L of hydrochloric acid per day.
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
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