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2) Why hasn't anyone ever come back to visit us?
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You never know, someone might have come back in time. Just because someone hasn't said, "Hello, I'm from the future." doesn't mean they're not there
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Also, they can't come back to the past and change the future as the past has already happened. Whatever they do (because it's already happened) is already a part of the future.
...If that makes sense...