microscope

In 1932, German physicist Ruska and German Electrical Engineer Knorr invented the world’s first electron microscope. In the same year, Rusca published his paper”the development of geometric electron optics” and used the name of electron microscope for the first time. Therefore, this year is also recognized as the next year of the development of electron microscope. In addition to animals and plants, nature also has a huge microbial world. They are all very small. Even if hundreds of millions of microorganisms are piled together, they are only as big as…