A little bit of history
The first microscopes were invented in the early 1600s. One scientist who built and used an early microscope was Robert Hooke. In 1665 Hooke observed a thin slice of cork through a microscope. The tiny walled spaces he saw in the cork reminded him of tiny rooms. So he called them cells. Over the next 200 years, scientists learn more and more about the cells. They learn that the cell is the basic unit of structure and function of all living things.
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