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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.