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Hans and Zacharias Janssen invented the first compound microscope in 1590.
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Robert Hooke designed his own microscope and found out that matter was made up of things called cells in 1655.
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All living things are made up of cells. Cells are the basic unit of life. All cells only exist because of cells before them.
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In 1674 Anton van Leeuwenhoek saw and described bacteria, protists, and sperm/blood cells.
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Matthias Schleiden published how cell theory was applied to plants in 1838.
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Theodore Schwann published how cell theory was applied to animals.
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In 1869, Rudolph Virchow is credited with creating cell theory and is thought to be the first to recognize leukemia cells.
