NAME THE DISCOVERY OF FOLLOWING PERSONS;
57. Ernst Ruska
58. Barbara McCintock
59. Henry Ford
60. Allen Cormack
Ruska was born in Heidelberg. He was educated at the Technical University of Munich from 1925 to 1927 and then entered the Technical University of Berlin, where he posited that microscopes using electrons, with waves 1,000 shorter than those of light, could provide a more detailed picture of an object than a microscope utilizing light, in which magnification is limited by the size of the wavelengths. In 1931, he built an electron lens and used several of these in a series to build the first electron microscope in 1933.
Barbara McClintock (June 16, 1902 September 2, 1992) was a pioneering American scientist and one of the world's most distinguished cytogeneticists. McClintock received her Ph.D. in botany from Cornell University in 1927, where she was a leader in the development of maize cytogenetics. The field remained the focus of her research for the rest of her career. From the late 1920s, Mc ...more