I have recently developed a crank theory, for which I can adduce no real evidence, that the human sense of time has its origins in story, or is at least bound up with the telling of stories. If, as science suggests, we were nomadic creatures for a very long time, changing place often — as the mountain gorilla, one of our fellow primates, does today — then the lives of our ancestors would have been shaped by the sense of leaving one place and moving on a path toward a new place. As we went on, we would form a memory…