Bruce Nuclear Plant

TORONTO, ON - SEPTEMBER 11: BRUCE NUCLEAR PLANT. The uranium used for nuclear fission, seen here as it comes into the plant and stored, produces energy for nuclear power and to drive the explosion of nuclear weapons. Both uses are made possible because certain substances called nuclear fuels undergo fission when struck by free neutrons and in turn generate neutrons when they break apart. This makes possible a self-sustaining chain reaction that releases energy at a controlled rate in a nuclear reactor or at a very rapid uncontrolled rate in a nuclear weapon. (Rene Johnston/Toronto Star via Getty Images)