I like John Scalzi's differentiator, which is, "So, that McGuffin of Doom you're carrying around....does it have a battery?" If the answer is "yes, there is a tiny reactor core in the handle," then it's SF. If the answer is "no, I am drawing upon the universal life force to make it go," then it's fantasy.
All science fiction might be able to be called fantasy, but not all fantasy can be called science fiction. unless "scienceless" is a new category of science fiction... oooh, actually, i bet that'd be cool.
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