Exactly, most science fiction representations fail on the engineering test. That' snot to say that some future change in our understanding of physics might not

Exactly, most science fiction representations fail on the engineering test. That' snot to say that some future change in our understanding of physics might not change what is in fact possible. One reason I love scifi is that the authors/readers/watchers are free to drop the need to be fully grounded and go for something truly cool. I suspect what we view as totally impossible today, might be within the realm of possible 2-3k years from now.