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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The longest a person has survived after a heart transplant is 24 years.
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Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.