Science fiction, which has at times been downsized to just sci-fi, is a classification of fiction that may entail real or nonexistent science and technical knowledge in portions of its telling of a story or idea. They may range from believable to hypothetical about various subjects or space, time, or fantasy. The storyline could place the origin of the subject from past beginnings to those places yet to be explored or yet imagined. A plot could contain just one subject matter or a combination of more than one with ideas ranging from current breakthroughs in science, prospective concepts on the horizon, or thoughts just forming in the minds or dimensions and universes of contemplation.