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1300s: Spectacles are used for the first time

1300

1590: Hans and Zacharias Janssen invent microscope

1590

1667: Robert Hooke discovers cells with a microscope

1667

1675: A. van Leeuwenhoek uses microscope to look at insects and other things

1675

18th century: Microscopes improve and become more popular among scientists

1700

1903: Richard Zsigmondy invents ultramicroscope

1903

1932: Phase-contrast microscope developed by Frits Zernike

1932

1938: Ernst Ruska invents the electron microscope

1938

1981: G. Binnig and H. Rohrer invent the scanning tunneling microscope

1981