Cryosol: Cryosol, one of the 30 soil groups in the classification system of the Food and Agriculture Organization (FAO). Cryosols are characterized by frozen soil ... Britannica.com
Robert A. Millikan's Definitive Measurement. Robert A. Millikan started his work on electron charge in 1906 and continued for seven years. His 1913 article announcing the determination of the electron's charge is a classic and Millikan received the Nobel Prize for his efforts.
1. Early History of Electron Microscopy: 1931 to 1960. The invention of the electron microscope by Max Knoll and Ernst Ruska at the Berlin Technische Hochschule in 1931 finally overcame the barrier to higher resolution that had been imposed by the limitations of visible light. Since then resolution has defined the progress of the technology.