Heavy Water and the Atomic Bomb
Competition between scientists leads to an array of discoveries, including the neutron and the positron. Technical advances, such as the Geiger counter and the cyclotron, support research. With the discovery in 1931 of deuterium, heavy water becomes important, with Karl-Friedrich taking the early lead. The Norsk Hydro plant in Vemork, Norway, is one of the few places in the world that can produce heavy water in quantity. In 1938, German scientists fission the atom and the race to build an atomic bomb begins.