When the United States successfully tested the first atomic bomb, the scientist Oppenheimer (Julius Robert Oppenheimer), the main developer of the atomic bomb, "had some doubts about the work he had done. Panic", and the feeling of "I have become the god of death, the destroyer of the world" emerged in my heart. So much so that as a member of the U.S. delegation at the United Nations General Assembly, he blurted out: "Mr. President, my hands are stained with blood."