Write an introduction and an epilogue to Ted Chiang's "Exhalation" for a reader who is unfamiliar with science fiction and does not take the genre seriously. Your introduction will explain the purpose of science fiction in general and use figurative language to make science fiction easier to understand or to prepare the reader for some of the ideas and situations in the story. The epilogue will consist of a formal, objective summary of the story to clear up any confusion about what happened. In either the introduction or the epilogue, discuss at least two major themes in the story to help the reader understand how science fiction can engage with important ideas.