Is time travel still considered as a possibility? What does the newer theories like string theory, M theory, etc. say about it.
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Possible duplicates: http://physics.stackexchange.com/q/7823/2451 and links therein. – Qmechanic Mar 07 '13 at 00:21
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Well, 2 years have passed since that question, something fundamental could theoretically have happened to change the answer :) – jwenting Mar 07 '13 at 06:54