Then how do you explain the fact that something is predicted, cannot be altered? What difference is there between a prediction and actual travel, as far as the ability to alter the "line" is concerned?
Your conciousness determines your own course. Your desires combined with everyday actions form a plausible prediction of a future. I would think that the number of variables to take into account would be immense, too much for your concious mind, so instead, your subconcious does the job... And that is where concious and subconcious meet: Dreams.

When something is predicted the person is looking at the events occuring then at a later point, or rather they're basically transferring their conciousness to a later point where they can view what is occuring, before returning back. While this prediction can then be changed by an overall change in the events to occur via time travel, the peering ahead counters out the potential of that changing things(They'll be seeing what would've happened by seeing ahead). So yes, time can change, but the possibilities of it changing after a prediction are made are based on how often predictions are made, the length of time before the event, and the chances of someone traveling through time and altering the events of the past.

I've always thought about that, but then that would mean we're able to perceive everything occuring in the world with nothing more than our minds. Does that, in turn, mean we have a sixth sense of sorts that can see all and know all?

time travel eh? sci-fi hogwash........

as for the future/fate ordeal.......Preston has right....and i'm assuming he's read Hume(?) before......the philosophy is that we think of free-will, anti-fate, and the future, as being something we can choose.....yet, we really can't......like tomorrow, you can either get up and go to work, or don't....thatz your choice as of the present......yet, when tomorrow becomes the past, it is locked into place.....hence, did you really have a choice in the matter at all? you would like to think so, but the choice you did choose, IS THE CHOICE YOU CHOSE, and hence....the fate of the future....though, unknown to us in the present

many people underestimate the human mind. as humans we only use a small percentage of our brains and i believe that once one taps into the "unused" parts these types of enigmas would be answered.
our futures are determined by the actions and choices we make in our everyday lives, and every action or choice we make has consequences. not always bad ones but consequences none the less. i believe that the sixth sense is intuition. i'm sure everyone here has at one point in there lives KNEW something was going to happen. when i was a bit younger i used to skip class ALOT. i would go days without going to class until one day i thought to myself "wow today i am busted" and sure enough i would be. that has happened several times with different things. i figure that stress, hormones, or some type of endorphine perhaps stimulates that sixth sense we has that allows us to know the exact consequence of that choice.

wow i got really excited when i saw this. me and my physics teacher had a discussion which directly relates to this. basically, somebody asked in class something like the following: when we move a book from point a to point b, does it exist in the new place before it ceases to exist in the old place? note that the distance between points a and b can be arbitrarily - even infinitely* - small. due to the nature of a continuous function, no, we would assume that the object existed in all the infinite points in between. but it can't exist in an infinite number of points! we then concluded that instants of time don't exist. although this is almost implicit in science the consequences are often ignored. nothing ever exists at any given time. points in time are like points on a line: used for reference but themselves illusory. points don't exist! instants can't possibly exist, because otherwise the book would have to exist in two places at once, or disappear and reappear. the most immediate application of this new concept of "no instants" is that the present is an illusion, or is at least not instantaneous. everything has duration. which means that the absolute present is the limit of time as the past approaches the future, or vice versa. but this is assuming that the future exists independently of the past (hence people have free will, can change the future, etc.) however, if the future depends wholly on the past, then the two "timespace" functions are really the same function (that is, the function reality(time)). but where am i going with this? if there is no present, except as a sort of limit or meeting point of the past and future [or just the one-sided limit if either one of those doesn't exist, or if neither exists, you've had too many vaults] then it would be just as valid to question whether the future depends on the past as whether the past depended on the future. it's a 2-way street. i think the general idea of "fate" is that what we will do tomorrow depends on what we did yesterday. but what if what we did yesterday depends on what we did tomorrow, and instead of marching towards a single end we are approaching what depends on what will then still be yet to come? that, my friends, is the blunt of my question to you: are we looking at "fate" backwards? and if the past depends on the future, is that fate or free will? i like this discussion and don't want to see it go away