Fiction is one of the most powerful expressions of human imagination our species can produce. It is a genre speculating about our future that departs from our current reality in various important ways. Science Fiction knows no boundaries but it generally can be classified into one or more of the following genre: hard science fiction, speculative fiction, high tech fiction, war fiction, fantasy fiction, horror fiction, supernatural fiction, superhero fiction, utopian and dystopian fiction, apocalyptic and post-apocalyptic fiction, and alternate history. That just about covers everything.