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Then I guess I'm gonna get a chance to talk to my future self soon...
Kidding aside, how do you suppose time travel could be done? Put all the SF aside and think a bit...
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We really don't know enough about time and it's operations yet exactly. But one point being is that if we do invent a time machine, it won't be coming into the past, or if it does it'll be very careful. Because then if it ever did come back to our time period, we'd know about it now.
Despite our array of knowledge, we still know very little about the operations of the universe and many such things. We're only simple creatures really, and we still (unless global warming ruins everything) got plenty of time to learn more.