>> year zero. >> it's the theory -- >> zero would be nice. >> they figured out how to respect each other. how do appreciate each other and like each other. >> they did. i think groves was a really sharp guy also. he went to m.i.t.. he wouldn't mind playing adult in front of the scientists. but he knew what was going on and he understood the science. really a masterful call putting him in charge of the project. >> the russians have a bomb, we are supposed to be years ahead of them but -- what were you guys doing? was its security tight? >> the story requires all of these characters, some of which are obviously household names, like cillian playing oppenheimer. and then there is the last known folks that i found really compelling as well. like getting to play strauss, who was a really fascinating american character. >> strauss was one of