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Antonie van Leeuwenhoek writes a letter to the Royal Society describing "animalcules", later known as protozoa.
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Antonie van Leeuwenhoek
Dutch microbiologist (1632–1723)
Antonie Philips van Leeuwenhoek was a Dutch microbiologist and microscopist in the Golden Age of Dutch art, science and technology. A largely self-taught man in science, he is commonly known as "the Father of Microbiology", and one of the first microscopists and microbiologists.…Source: Wikipedia (CC BY-SA)
Animalcule
Antiquated term for microorganisms
Animalcule is an archaic term for microscopic organisms that included bacteria, protozoans, and very small animals. The word was invented by 17th-century Dutch scientist Antonie van Leeuwenhoek to refer to the microorganisms he observed in rainwater.Source: Wikipedia (CC BY-SA)
Protozoa
Single-celled eukaryotic organisms
Protozoa are a polyphyletic group of single-celled eukaryotes, either free-living or parasitic, that feed on organic matter such as other microorganisms or organic debris. Historically, protozoans were regarded as "one-celled animals".Source: Wikipedia (CC BY-SA)
September 17
Day of the year
September 17 is the 260th day of the year in the Gregorian calendar; 105 days remain until the end of the year.Source: Wikipedia (CC BY-SA)