Charles Oppenheimer, the grandson of the creator of the atomic bomb, spoke at a news conference in Japan, stressing that we should never use the bombs again. We listen to the news story and review the expression "ikenai" in "genbaku ya bakudan o tsukatte wa ikenai" (atomic bombs and bombs in general should not be used). We also learn about the story behind "senbazuru" (1,000 folded paper cranes).