Context: At Princeton, the physicist Robert R. Wilson encouraged Feynman to participate in the Manhattan Project—the wartime U.S. Army project at Los Alamos developing the atomic bomb. Feynman said he was persuaded to join this effort to build it before Nazi Germany developed their own bomb. He was assigned to Hans Bethe's theoretical division and impressed Bethe enough to be made a group leader. He and Bethe developed the Bethe–Feynman formula for calculating the yield of a fission bomb, which built upon previous work by Robert Serber.

Question: Which weaponry research did Feynman engage in?
Answer: Manhattan Project

Question: Whose division was Feynman assigned to at the Manhattan Project?
Answer: Hans Bethe

Question: What did Feynman produce with the help of Bethe?
Answer: Bethe–Feynman formula

Question: What was the purpose of the Bethe-Feynman formula?
Answer: calculating the yield of a fission bomb

Question: Who had previously worked on fission bomb yields before Feynman?
Answer: Robert Serber

Question: Which weaponry research did Feynman oppose?
Answer: Unanswerable

Question: Whose division was Feynman restricted from at the Manhattan Project?
Answer: Unanswerable

Question: What did Feynman produce without the help of Bethe?
Answer: Unanswerable

Question: Why was the Bethe-Feynman formula unnecessary?
Answer: Unanswerable

Question: Who had never worked on fission bomb yields before Feynman?
Answer: Unanswerable