Blind BombingSilver Medal winner in the Independent Book Publishers Awards Late in 1939 Nazi Germany was poised to overrun Europe and extend Adolf Hitlers fascist control. At the same time, however, two British physicists invented the resonant cavity magnetron. About the size of a hockey puck, it unlocked the enormous potential of radar exclusively for the Allies. Since the discovery of radar early in the twentieth century, development across most of the world had