Physics and uranium -- On the trail of the nucleus -- Lisa Meitner -- The Meitner-Hahn discovery -- Enrico Fermi -- The Rome experiments -- The events of 1938 -- Christmas 1938 -- The Heisenberg menace -- Chain reaction -- The Nazi nuclear machine -- Copenhagen -- The moment of truth -- Building the bomb -- The decision to use the bomb -- Evidence from a spying operation -- The Cold War -- Uranium's future.