Welcome to the course. In short this course covers the history of the development of the atomic bomb. It turned out that the scientific breakthroughs in atomic and nuclear physics during 19th and the first part of 20th centuries led to development of atomic bomb. We will focus mostly on the role that scientists, science and technology had in developing and resisting nuclear weapons. The course will be taught primarily from the point of view of the history of the science involved. Also the students will see the need for the integrated perspective in order to understand how science, political history, ethical values and personal motivations are interconnected in this story.