He also wrote the finest single work of sacred music in history, the Mass in b minor, which has been argued by many musicologsts and composers to be the single greatest work of music of all time, in any genre, in any style. Whereas, most composers did not typically relish complexity, Bach was at home in it.
It is difficult to say who invented the compound microscope. Dutch spectacle-makers Hans Janssen and his son Zacharias Janssen are often said to have invented the first compound microscope in 1590, but this was a declaration made by Zacharias Janssen himself during the mid 1600s. The date is unlikely, as it has been shown that Zacharias Janssen actually was born around 1590.
The most common is the optical microscope, which uses light to image the sample. Other major types of microscopes are the electron microscope, the ultramicroscope, and the various types of scanning probe microscope. Circa 1000AD â The first vision aid was invented (inventor unknown) called a reading stone.