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Magnifying glasses are mentioned in the writings of philosophers but were sometime invented in the thirteenth century.

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Galileo formulated the principles of lenses and focusing, which lead him to create something called the Galilean telescope which was commonly used in 1609.

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Robert Hooke built the first useable British microscope. Robert Hooke was born on July 28, 1635 and was an English scientist, philosopher, and architect. He discovered the law of elasticity, now known as Hooke's law.

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Anton Van Leeuwenhoek created single lensed microscopes to make better observations on bacteria, he was also the first to experiment with microbes.

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Max Knoll and Ernst Ruska created the electron microscope. The electron microscope is used to research the detailed structure of tissues, cells, and organelles.