In 1678, I reported to the Royal Society that I have discovered "little animals" -- bacteria and protozoa -- in various samples. The society asked Hooke to confirm my findings, and he did!
Hi! I'm Antonie Van Leeuwenhoek and I observed living cells with a small lenses.
The discovery of the cell was made possible by the invention of the microscope, which was made possible by improved lens-grinding techniques.
My single most important discovery was the existence of single-cell organisms. While I was using a microscope to examine pond water in 1674, I observed dozens of protists, which I called 'animalcules,' as well as spirogyra, or green algae.
The existence of single-celled organisms not only opened an entirely new unseen world for biologists but also established the field of microbiology.
My discovery helped to form the basis of cell theory and discredit the idea of spontaneous generation.