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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 20 feet of blood vessels in each square inch of human skin.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.
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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.