To his many Nobel Prize-winning colleagues, Georg Placzek was a physicist of boundless importance. It was not because of a breakthrough discovery on his part, or because he published widely, but because he tended to be the man with the right wits at the right time. At Los Alamos, New Mexico, on July 16th, 1945, he was the only Czech present for the detonation of the first nuclear explosion – an event he had helped to create.
