J. Robert Oppenheimer "plunged into a deep depression" after he created the atomic bomb.
Days later when the US dropped a second bomb on Nagasaki, things began to change for the physicist, The Post reported.
Oppenheimer didn't think it was necessary or justified to drop the second bomb, according to the Post.
"Mr. President, I feel I have blood on my hands," Oppenheimer told Truman, according to Bird's book, "American Prometheus," the Post reported.
Oppenheimer then began to publicly denounce the use of his atomic bomb, much to the NSA's dismay, Bird said.
Persons:
Robert Oppenheimer, Kai Bird, Harry Truman, Oppenheimer, Kai Bird —, Oppenheimer —, Truman, Mr, Bird, Biden, Energy Jennifer Granholm
Organizations:
Service, Manhattan, CBS, Washington Post, Post, Energy
Locations:
Wall, Silicon, Hiroshima, Nagasaki, Alamos