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Zaccharis Jassen and his son invented the first simple compound microscope that uses two lenses.
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In 1665, Robert Hooke reminded him about the small room in which monks lived so, he called them, "cells".
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In 1674, a Dutch merchant called, "Anton Van Leeuwenhoek" experimented with the grinding of lenses. He built a simple microscope with only one lens. He made 240 different microscopes.
