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Originally posted by Jonna
Time travel has already been proven, but it is not exactly what you would expect. It is not possible to go back in time before you started. Only to slow time down for one or speed it up for another.
Simple proof: There are some humans that will use any new technology for their own gain and being that there does not seem to have been any major problem with 'time' then it is only logical to assume that the technology to go back in time has never been created.
ALTHOUGH, it would be an interesting story line on how people like Jack the ripper were never caught.