Well, we all know that time isn't fixed. It will crawl when you want it to go fast, and it will go fast, when you want it to crawl...
I once read something about time travel that I might think is true. It said you couldn't physically travel back or forth in time (except, using natural events, such as the passing of time). But you could go as an "observer".
There's also a nice short story by Robert Silverberg: "When we went to see the end of the world" that shows a very interesting view about time travel.
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