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Jansen creates first compound microscope.
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Antoni van Leeuwenhoek learns to how to assemble microscopes by grinding lenses.
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Robert Hooke publishes, "Micrographia" which contains sketches and information about cells.
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Francesco Redi discovers, contrary to the idea of spontaneous generation, that meat only attracts maggots, and does not spawn them.
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Anton Von Leeuwenhook is the first to observe single cell organisms, now known as protazoa.
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Robert Hooke reported to the Royal Society that he discovered, "little animals".
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Robert Brown discovers the nucleus of cells, and their importance within the cell.
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Schleider and Schwann begin their work on the Cell Theory
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Albrecht von Roelliker discovers that sperm and eggs cells are cells.
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Rudolf publishes, "Biogenic Law" stating that all cells must rise from other cells, and that disease affects cells.
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Pringsheim observed how a sperm cell penetrates an egg cell.
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Kolliker discovers mitochondria.
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Rudolf Virchow adds to the Cell Theory, saying that all living things must rise from other living things.
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Louis Pasteur disproves the widely accepted idea of spontaneous generation, using his famous experiment using maggots and meat.
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Mitosis is discovered by Walther Flemmings.
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Flemming discovers the behavior of chromosomes during mitosis.
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August Weissman proposes the change< "Biogenic Law" saying that cells can also trace ancestry back to the beginning of time.
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Golgi discovers the Golgi Aparatus.
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Louis Pasteur in Robert Kosh study bacteria.
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Using the phase angle of cells, Fritz Zernike discovered how to view unstained cells.