Margaret Broderick worked on the Manhattan Project as a chemist at MIT. In this interview, she describes the laboratory where she was employed and the secrecy and "tight" security that surrounded the project. She elaborates on the background check procedures required for workers. Broderick also recalls the wartime culture and environment in America, offering insight into military-civilian relations and social life during World War II.

David Hawkins was a philosophy professor who became the administrative aide at the Los Alamos Laboratory in 1943 and the Manhattan Project's historian in 1945-46. In that role, he had free access to all the top people involved, including project director J. Robert Oppenheimer and physicist Edward Teller. In this interview, Hawkins describes his encounters with lawyer Cliff Durr after the war, when he, like Oppenheimer, was facing suspicion from the U.S. government for his involvement with the Communist Party. The rest of the interview is a discussion of the nature of the Communist community in Berkeley before the war. Hawkins describes a familial group of intellectuals from a plethora of disciplines, and recalls some of his friends who were Communist Party members, including Frank Oppenheimer and Phillip Morrison. Hawkins also describes Oppenheimer's remarkable ability for getting people to agree with each other, as well as his wide-ranging interests and need for one-upmanship.

Louis Hempelmann was a doctor and radiologist who worked on the Manhattan Project at Los Alamos. He was a close friend of J. Robert Oppenheimer, his wife Kitty, and their children. In this interview, Hempelmann explains how and why he was recruited for the Manhattan Project. He recalls an early conference there on the bomb at which Edward Teller was criticized for his obsession with the hydrogen bomb. Hempelmann remembers going horseback riding with Oppenheimer and Kitty, and watching their children during the Atomic Energy Commission hearing that resulted in Oppie's security clearance being revoked.

Mack Newsom was a member of the 509th Composite Group. He worked as an airplane mechanic and B-29 engine specialist. He was part of the ground crew for the B-29 Silverplate plane Next Objective. In this interview, Newsom discusses the details of his work on B-29s and what he and his fellow mechanics did to maintain the plane. He also describes the working conditions on Tinian, including the climate, accommodations, division of labor, and water shortage on the island. He reflects on the use of the bomb, and how those stationed at Tinian came to learn of Hiroshima. Newsom also recalls going to Cuba when Next Objective was assigned there for temporary duty.

Roslyn D. Robinson worked as a driver and in the administration office for the Chicago Met Lab. Her husband, Sidney, was an engineer who worked on the Manhattan Project. In this interview, she talks about her early life, as well as her duties in Chicago and the omnipresent emphasis on secrecy. She recalls her husband's hospitalization and quarantine after a mysterious "spill" in his laboratory at the New Chem Building. She also remembers learning about the project's true purpose when Little Boy was dropped on Hiroshima, her reaction to that event, and how the Project continued to affect their lives after the war.

Ted Taylor Part 4: From 1948-1956, Taylor worked at the Los Alamos National Laboratory, developing fission bombs of minimal size and maximal capacity. Later in life, while working for the Defense Department, Taylor began to realize the real-world implications and consequences of the bombs he developed. In this interview, he discusses the effect of the Korean War and the pressure to produce atomic weapons. Taylor elaborates on how he developed a great distrust of the nuclear industry, the politics of it, and way the process overstressed secrecy and lying. Finally, Taylor explains how he initially came to be a designer of nuclear weapons, and how he believes that fascination with nuclear weapons is like a disease.