Feynman secured permission from Oppenheimer to give a lecture to the recruits. “They were all excited: ‘We’re fighting a war! We see what it is!’ They knew what the numbers meant. If the pressure came out higher, that meant there was more energy released. Complete transformation! They began to invent ways of doing it better. They improved the scheme. They worked at night.”65 Productivity went up by a factor of ten.
