Reality

It has been said that you cannot change the past. We are locked in to whatever has happened; whatever is – is. If you traveled to the past to affect a change, that change would cancel out the attempt to make a change.
Is there a past! Is there a Future? Is there just the "Here, and Now?"

The Greek philosopher, Parmenides, said that what really exists is a unity that is unchangeable. This conclusion seems to not make sense because we observe change everywhere, but Parmenides isn't talking abou...