The atomic bomb, which started with quantum mechanics. The introduction of internal power to implement the bomb. Little Boy and Fat Man's Story of completion and role. It felt like it was being delayed, as it would be done from front to back. But I think it was the author's intention in making up two sections. In Part 2 the author explains why he has explained almost all scientific explanations in page one. The second focus is on the influence that will follow the completion of the atom bomb