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Credit: © 2007 Twentieth Century Fox
The stuff of fantasy and science fiction seem more and more like reality as science and technology continue to advance. Why not then look at imaginary worlds to get a glimpse at what tomorrow might be like? Here are 20 realms that have captured our imaginations before, rated by how plausible they might be, from possible to optimistic to hard to imagine to pure fantasy.
WARNING: Potential spoilers.
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