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Aristotle recognized the value of studying organisms, starting an approach to philosophy and biology.
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Zacharias Janssen created the first compound microscope, which could magnify images approximately 3x when fully closed and up to 10x when extended to the maximum.
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Jan Baptist van Helmont studied plants and made the theory that plants grew by eating soil and he concluded that plants grew by drinking water.
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Robert Hooke described cellular composition of cork and introduced the word cell to science.
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Anton van Leeuwenhoek improved the magnification of microscopes by polishing the lenses.
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Anton van Leeuwenhoek discovered bacteria from a sample of saliva he took from his mouth.
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Lorenz Oken proposed that all organic beings originate from and consist of vesicles or cells.
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Robert Brown learned about and described the cell nucleus.
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Matthias Schleiden discovered and announced that plants are made of cells.
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Theodor Schwann discovered and announced that animals are made of cells.
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Albrecht von Roelliker realized that sperm cells and egg cells are also cells.
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Louis Pasteur experimented and resulted in a process called pasteurisation.
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Rudolf Virchow stated that all living things come from other living things, also known as Cell Theory.
