I, too, have read books by Brian Greene, and I agree with him.
If somehow you were to travel back in time, no matter what your intention is, you will end up creating the timeline you came from.
For example, you won't be able to kill your father no matter what you did. Even if you had to drop a a-bomb on the city your dad is in, he'd be out of town, or something to that effect.
So I think traveling in time is purely for observation, you won't be able to actually affect anything that would change your timeline.
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Will think of a clever one later.
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