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Aristotle was a Greek philosopher. He invented the field of formal logic in 330 B.C. He was the first to develop a formal system for reasoning. "Aristotelian" logic dominated until the rise of modern propositional logic and predicate logic 2000 years later.
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Janssen created the telescope in 1590. He helped us see a new world of living things.
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Helmont discovers photosynthesis in the early 1600's. He learned that by growing a tree, waiting five years, and then he discovered the tree had grown.
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In 1668, Antoni van Leeuwenhoek learned how to grind lenses and assemble them into simple microscopes. He was a Dutch Tradesman. He helped make the discovery of a cell possible.
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Robert Hooke was an English physicist. He discovered the law of elasticity. Which, was later known as Hooke's Law. The law of elasticity states that the stretching of a solid body is proportional to the force applied to it. He did research in a variety of fields.
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Lorenz Oken was a German naturalist. He speculated about the significance of life. They believed to be derived from a vital force that could not be completely understood through scientific means.
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Robert Brown was a Scottish Botanist. He was responsible for the discovery of the nucleus. In 1831, Robert was studying the epidermis of the orchids under the microscope when he discovered the nucleus.
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Matthias Jakob Schleiden was a German Botanist. While looking at a plant sample, he was the first to recognize that plants and parts of plants are composed of cells. In 1838, Matthias declared the cell as the basic structure of a plant. He cofounded the cell theory with Theodor Schwann.
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Theodor Schwann was a zoologist. When talking with Matthias Schleiden, Schwann came to similar conclusions while studying the animal tissue.Theodor found that cells are the basic unit for animal structure. He helped cofound the cell theory with Matthias Jakob Schleiden.
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Albrecht von Roelliker was a Swiss anatomist, physiologist, and histologist. Albrecht discovered using a powerful microscope that the sperm and egg were composed of cells. So, that means humans are formed of cells from beginning to end.
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Rudolf Virchow was a German pathologist, statesman, and physician. He continued the work of Schleiden and Schwann. Rudolf discovered that all living cells must rise from pre-existing cells. This becomes a concept in the cell theory.
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Louis Pasteur was a scientist. He set out to disprove spontaneous generation. Louis invented a process where bacteria could be removed by boiling and then cooling liquids. The first test was on April 20, 1862. It was later known as pasteurization. Pasteurization later helped keep milk clean and save people from diseases. It also helped prevent deaths from tuberculosis, scarlet fever, typhoid fever, and other diseases from milk.
