Nuclear Holocaust

Perhaps one of the biggest concerns of modern time is the use of nuclear weapons. Movies have been made depicting life after the explosion of an atomic bomb in a major city. World history of the past 75 years records the actual use of and consequences of such weapons.

What do you know about the history of nuclear holocaust? When have nuclear weapons been used? What have the consequences been of nuclear weapons? Some ideas to jog your memory: Hiroshima, Chernobyl, World War II...

(Hint: In this question the word "holocaust" is used to mean trauma, devastation of a serious magnitude NOT as a title for what happened in Germany during the 1940s!)