Leeuwenhoek Observes Microorganisms

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A Delft draper named Antonie van Leeuwenhoek, grinding lenses as a hobby with obsessive precision, peered through a single-lens microscope at a drop of lake water and saw tiny creatures darting and tumbling in a world no human had witnessed. He called them animalcules. Microbiology had begun in a haberdasher's workshop.