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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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The average office desk has 400 times more bacteria on it than a toilet.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.