Any historical situation contains elements of both the particular and the universal. The job of the historian is to help disentangle the universal from the particular, and understand the relationship between them. No moment is ever exactly the same as any other, just like no human being is exactly the same as any other. Nevertheless, there are things that we do learn from the past about the human condition: we learn, for instance, how quickly people can normalize the abnormal. We learn how things that people believed totally unimaginable can become the new normal just a few months later. We learn that most people most of the time will behave in a way shaped by the social situation in which they find themselves.