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Leeuwenhoek made one of the earliest practical microscopes
A '''microscope''' is an instrument that enables the user to view objects smaller than can be seen with the naked eye. The word ''usually'' refers to an optical compound microscope. Other kinds of microscopes will be discussed later.
A '''microscope''' is an instrument that enables the user to view objects smaller than can be seen with the naked eye. The word ''usually'' refers to an optical compound microscope.
[[Leeuwenhoek]] made one of the earliest practical microscopes and observed tiny "animalcules" under its high magnification (270X). No one knows why he did not realize that these were [[germs]]. Two centuries would pass before [[Pasteur]]'s [[germ theory of disease]]. --[[User:Ed Poor|Ed Poor]] 12:49, 6 April 2007 (EDT)
==Optical compound microscopes==
==Optical compound microscopes==