Today is September 11. Ten years has passed since the terrorist attacks in NY, America. And half year has passed since the Tohoku big earthquake disaster of Japan too. I felt that there's a mystery with the tragedy in both America and Japan. There are memorial ceremony in USA and Japan. These sad events sends us a message and we must think about it. The retaliation is no good. The nuclear power generation is not needed any more. It is simple but it is difficult.