 For example, Lewis suggests that when we talk about people, we often require the counterparts to have a very similar origin, while allowing for different careers and lifespan. In such a context, we might judge that Biden might have died as an infant. In other contexts, however, we may wonder what would have been the case if Biden had been born to different parents, relaxing the requirement of similar origin (see e.g., Lewis 1973b, 41).