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I'm a bit confused about the concept of mundane sci-fi -- what's sci-fi about it or, rephrasing slightly, why is it not just plain old fiction?
The sci-fi part of it is the extrapolation into practical applications or social consequences of established science. If we take, for example, genetics, both X-Men and Gattaca are genetic sci-fi, but only Gattaca is credible from a scientific standpoint.