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Zaccharias Jassen and his son invented the first microscope with 2 lenses.
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Robert Hooke used a crude microscope to observe a thin slice of cork. He was the first person the use the word "cell" the describe the smallest unit of life, because it looks like the monk's rooms.
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Anton van Leeuwenhoek was a dutch merchant. He was the Father of Microscopy, he made over 240 microscopes and he was the first to describe the microorganisms under a microscope.