So, if time travel is possible, how come no one's come back & told us about it yet?

If it is possible (and that's a HUGE "if"), there would have to be some kind of rule to the effect of "you cannot allow your actions in the past to affect the future."

There was an episode of the old "Twilight Zone" TV show that touched on that very topic.

A man named John Titor claims he has traveled into the future and has returned. I heard him speak on the radio and some of his predictions were fairly accurate. Do I believe he can travel through time, no. But, it was interesting radio

No. If time commute became actual, good judgment might let us know that the guy time travelling could desire to in basic terms pass lower back to the ingredient while the 1st time device got here online, in any different case there could be no place for them to be gained. for this reason, we wont see human beings from the destiny until the 1st time device is performed and became on.