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It was created by Zaccharias Janssen and Han Janssen (who was his son). They made the first Compound Microscope.
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While viewing a slice of a cork through a microscope he saw small objects which he named "cells".
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He improved the first microscope (which Hooke used) and he observed living cells for the first time.
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With ideas and discoveries from Schwan, Schleiden, and Virchow the Cell Theory has been developed. It is composed of 4 main "laws" ; All living things are composed of cells, All cells come from pre-existing cells, The well-being of an organism depends on the well-being of the cell, and the cell is the basic unit of structure of all living things.
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While the botanist was observing a speciman, he came to the conclusion that ,"All plants are made of cells" which was the beginning of the Cell Theory.
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He came to the conclusion that, "All animals are made of cells" which helped to create a law in the Cell Theory
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Another addition to the Cell Theory was given by him which stated that ," All cells come from preexisting cells".
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He discovered the electron. This British physicist was examining the inside of an atom at Cambridge University and realized that there were negativly charged objects. We know these as electrons
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In about the 1930s the Transmission (TEM) and Scanning (SEM) Electron Microscopes were created. Max Knoll and Ernst Ruska created the TEM in Germany in 1931, but the SEM was designed a few years later in 1942. Both use a beam of electrons with energy to examine very tiny objects.
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He created the Phase Contrast Microscope which allowed colourless and transparent materials be observed. He also won the Nobel Prize in Physics in 1953
