Cells are considered the smallest unit of all living things. Because cells were first discovered using microscopes, the inventors of microscopes or parts of microscopes have been included in the cell and cell part timeline below.
460-370 BC: Democritus proposed that all things are made of small, invisible particles.
127-151 BC: Claudius Ptolemy used curved surfaces to magnify the appearance of objects.
1590: Hans and Zacharias Jansen created a primitive compound microscope by combining two convex lenses within a tube.
1665: Robert Hooke is accredited with discovering the first cell by looking at a piece of cork under a microscope.
1676: Anton van Leeuwenhoek discovered the first “animalcules”.
1683: Anton van Leeuwenhoek discovered bacteria from a sample of saliva from his mouth.
1838: Matthias Schleiden discovered plants were made of plant cells.
1839: Theodor Schwann discovered that animals were made of animal cells.
1967: Lynn Margulis developed the theory of endosymbiosis that explains how eukaryotic cells formed from symbiotic relationships amongst prokaryotic cells.
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