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Zacharias Janssen (1585 - 1638) was a Dutch scientist who was known for creating the first microscope around the 1580s. It is said that he had help from his father, Hans Janssen since he was a teenager at the time. He was also a spectacle maker, but his creation made numerous scientists want to use it.

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Robert Hooke (1635 - 1703) was an English Scientist who studied all aspects of Biology, Chemistry, and Physics. He is known for naming the term 'cell' in 1665. The chamber-like cells that he'd seen in his microscope had reminded him of the cells that monks used to sleep in. Due to an argument between him and Isaac Newton, no one knows what he looked like because Isaac Newton hid his portrait or destroyed it.

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Anton Van Leeuwenhoek (1632 - 1723) was a Dutch Scientist who, instead of buying the original Microscope, made his own in 1668. Once he made it, he went around town to observe cells with it. When he was writing down his discovery, he called the cells 'animalcules' because they looked like animals to him. He was also sending letters to his colleague in England, Robert Hooke.

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Matthias Schleiden (1804 - 1881) was a German botanist and a co-founder of the cell theory. After years of studying plants, in 1838, he realized that all plants were made of cells. When he and Theodore Schwann worked together on the cell theory, he came to a conclusion that cells appeared from free cell formation. His colleague did not agree with him.

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Theodore Schwann (1810 - 1882) was a German Physician and Physiologist and one of the contributors to the cell theory. After years of studying animals, in 1839, he too realized that all animals were made of cells. When he sent a letter to scientists working in the same field. When Matthias Schleiden replied, they both began to work together on the cell theory. Theodore Schwann came to the conclusion that cells came from pre-existing cells. His colleague did not agree with him.

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Rudolf Virchow (1821 - 1902) was a German physician and biologist who played a role in making the Cell Theory. He proved Theodore Schwann's Theory to be correct by research in 1839. Unfortunately, he stole this information from Robert Remack which led to more fighting between scientists in general.

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Today, it is believed that the cell theory consists of the facts that all living things are made of one or more cells, the cell is the basic unit of life  and that new cells are produced from pre-existing cells.