User blog comment:ProfessorMcG/Time Travel. Is it possible?/@comment-1777104-20100815194324

Guy, the analogy you presented is essentially what I presented on my blog and summarized above.

Time travel would be either in a "multiverse" or in a universe - many realities or just one. If one could go back into time within a multiverse, then he could be "free" to change anything within his abilities. If he came back to his own time line, he'd never know what the changes did. If he went ahead in the changed universe, he would co-exist with whatever "self" might have developed -- if indeed it had developed.that he would have survived or even been born, that is.