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Zacharias Jansen invented the first compound microscope

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And at some time before 1668, Antony van Leeuwenhoek learned to grind lenses, made simple microscopes, and began observing with them.

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In 1663 and 1664, Hooke produced his microscopy observations, subsequently collated in Micrographia in 1665.

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The first time someone says the term "cell"

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The cell theory is published by Matthias Schleiden and Theodor Schwann