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Zaccaria Janssen and his son Han discovered that putting multiple lenses will make nearby objects appear greatly bigger
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Zaccaria Janssen has passed away
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Robert Hook used a crude microscope to observe a thin slice of cork. Robert Hook was the first on to use the word cells. The small objects he saw in a microscope reminded him of where the monks lives.
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Anton Van Leeuwenhoek was a dutch merchant who experimented with the grinding lenses so see can observe better. Anton Van Leeuwenhoek built over 250 microscopes.