"No.—But then, it is the obvious which is so difficult to see most of the time. People say ‘It’s as plain as the nose on your face.’ But how much of the nose on your face can you see, unless someone holds a mirror up to you? In the twentieth century, Susan, we started a new cycle of wars—what shall I call them? Ideological wars? The emotions of religion applied to economic systems, rather than to extra-natural ones? Again the wars were ‘inevitable’ and this time there were atomic weapons, so that mankind could no longer live through its torment to the inevitable wasting away of inevitability. —And positronic robots came.