What do science fiction and fantasy have in common?

Good Science Fiction may include: interpolation and extrapolation speculation scientific application thought experiment exotic settings

There are many science fiction stories- the whole Atlantis genre, for example that have nothing to do with Space Travel but do go to Inner space- underwater, time travel, etc. Prepare to submerge!...

No, in fact many science fiction novel have been over-taken by recent event showing that their predictions are (were) actually true.

Science fiction, but it depends on how you look at it. I would say Sci-fi though, because it has beings from other planets in it. But it's up to you. Oh and S. Meyer says on her site that it's that.

To be honest, it varies a LOT, but I'll try my best to be helpful. Science fiction is generally of two key categories: dystopian or optimistic. But in general, the latter is more true. For example,...