We've seen this done in movies right? Well, why don't spaceships have this technology?

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Sources:
http://www.techtimes.com/articles/662...
http://blogs.scientificamerican.com/l...
http://www.artificialgravity.com/sw/...
http://content.time.com/time/magazine...
http://www.space.com/8384artificial...
http://www.bbc.com/future/story/20130...
http://www.popularmechanics.com/space...
http://newsoffice.mit.edu/2010/artifi...
http://www.geek.com/science/geekansw...
https://newsoffice.mit.edu/2015/exerc...