The scene where Oppenheimer poisons his tutor's apple at university is based on accounts that Oppenheimer gave of the incident, but it is unclear whether it occurred in real life. Oppenheimer is depicted as putting potassium cyanide in the apple before having a change of heart the next day and narrowly preventing it from being eaten. There is no evidence that Niels Bohr nearly ate the apple or had any involvement in the incident. Oppenheimer and Einstein were friends, but the specific conversations which the film revolves around never happened. Oppenheimer took his concerns about an unstoppable chain reaction to physicist Karl Compton at MIT, not Einstein. Although the film portrays Groves' aggressive recruitment of Oppenheimer, Arthur Compton at the Metallurgical Laboratory was the first to appoint Oppenheimer to take over the research into the bomb-design part of the Manhattan Project.