Time travel stories have been a around long before the science fiction genre was conceived. But what is time exactly? Here's an interview in Wired with Sean Carroll, a physicist who is trying to find the answer. It's a great read but I liked his answer as to whether time travel is possible. He doesn't rule it out but it isn't likely either. In other words, we just don't know.
Of course, it depends on how you define time travel. I time travel into the future at a rate of one second per second. Perhaps others travel at a different rate? ^_^
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