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Time travel backwards is either impossible or completely irellevant, anyway. You can't go back and, say, save Kennedy or Lincoln (or Franz Ferdinand) from being assassinated, because if it were possible, it already would have happened. So it is safe to say that the past is set in stone. Conversely, the future is one big unknown, making travel frowards into it wthout some sort of reconnaisance extremely dangerous. This isn't to say time travel is impossible, just exceedingly risky.
I also heard, once upon a time, that one's mass and volume or somesuch must increase as one approaches the speed of light, due to the effects of Relativity. Light speed requires essentially infinite mass, which would generate and infinite velocity, wouldn't it? And thus you'd be going not just FTL, but infinitiely faster than light. So travel backwards would be possible, if you really wanted to see the beginning of time.
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