InWorldWarII,thereweremountingfearsthatHitlerwasbuildinganatomicbomb.Suchaprospectdependedontwooftheworld'stopnuclearscientists;brilliantGermanphysicistWernerHeisenberg,andhisDanishmentor,NielsBohr.In1941,Heisenbergtravelled200milesinsecrettoCopenhagentomeetBohr.Themeetingputbothmenatimmenserisk,and...