History of science 1921 – 1960

World War 2 1939-1945
First atomic bomb explodes 1945
Edmund Hilary first to climb Everest 1953
Discovery of paleomagnetism
Salk produces polio vaccine
Watson and Crick reveal the structure of DNA
Chadwick discovers neutrons
Bohr discovers structure of atom
Transistor invented first integrated circuit is made, start of microelectronics
Tombaugh discovers Pluto
Habble discovers Universe is Expanding

Electron microscope c. 1939
Programmable electronic computer c. 1943
Fibre optics c. 1955
Artificial satellite c. 1959