wow, I just lost a few brain cells! Time cannot be changed!!!!

I agree. When you think about it, it doesn't make any sense trying to back to what has already happened. The only way to do that is to have people not even born yet. You cannot bring a dinosaur back to life. There is no parallel universe that is running years behind.

Man's theory's are weak, More often than not everything we thought was, turned out to be wrong. I don't see why time travel wouldn't be possible.