Artificial Intelligence Today, Google's AlphaGo has beaten Go champion Lee Sedol in its second of five matches. What about it if two AlphaGos had a match? In Person of Interest, the Machine and Samaritian have done battle. Or it is someone behind Machine and Samaritian that began to battle. The most distinct between Machine and Samaritian is from thier's owners. The former owner is full of justice in his mind, but the latter wishes to control the world. Will you feel scared if artificial intelligence's time had come? Maybe more frightening is an evil man, as Harold said. With the development of science, human being have a better understanding of brain science, and one day a machine also will imitate our thought. Besides, machines can break through limitation of human beings. So what will our world become?