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Anton Van Leeuwenhoek was the first man to witness, describe, and publish data on live cells, such as protozoa, amoeba, and bacteria. To accomplish this, he used simple (single-lens) microscopes that he had crafted.
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He seems to have been inspired to take a disciplined approach to microscopy by having seen a copy of Robert Hooke's very popular illustrated book, Micrographia. This publication described Hooke's own observations using the compound instrument that he had built himself.
While not the inventor of the microscope, Leeuwenhoek's simple microscopes certainly made significant improvements to the technology, especially in the shaping and grinding of the lenses. The capability of one of his single-lens instruments, far exceeded that of Hook's compound system.
Anton van Leeuwenhoek was a critical figure in the development of the cell theory as he was the first to observe living single-celled organisms under a microscope. His meticulous observations and drawings of these microorganisms helped lay the foundation for the understanding that all living things are composed of cells.
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