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lol
Please don't drag me into a Free Will vs Determinism discussion, we'll be here all night. 
But since you asked ( ), I don't really believe in either. Free will is a myth in my eyes. I think this was view was solidified when I saw a documentary about the human brain a few months ago.
While I don't profess to understand the science behind it all, basically there is strong evidence to suggest that by the time an individual consciously decides to commit an action, brain activity has already peaked and is in decline by this stage, meaning, depending on how you interpret this data, that actions are not performed by us of our own free will, but by the more "instinctive" part of the brain, deep in the unconscious. What we call "consciousness" is not the force that determines what actions we perform, but rather simply the one that makes sense of them. We believe we have free will because we seem to be consciously deciding what we do and don't do, where as in fact by the time we make these "decisions" the brain has already committed to that particular action. There are also philosophical reasons why I believe that true free will is an illusion, but it would take far too long to get into here.
As for determinism? Well, I don't really think that there can be too much doubt that causality exists (event B will occur as a direct result of event A) but strict determinism (which is what is necessary for clairvoyance to work) implies that if one knows the exact state of the universe at any particular point in time, they have the ability to predict, with unerring accuracy, the entirity of the future and the entirity of the past. I disagree with this logic, firstly because the Chaos theory states that everything is prone to change, so knowing the exact state of the universe will be no use in being able to determine, with certainty anyway, any future events (unless you want to argue that change is predictable, which would send you into a sort of Cartesian loop, as knowing that change is to occur to the original state of the subject - in this case the universe - implies absolute and infinate knowledge that can only exist given strict determinism. So, ultimately, determinism needs to be proven in order to prove determinsim). Secondly, as no-one will ever know the exact state of the universe, determinism becomes a fairly esoteric and idle inquisition anyway, that is no way applicable to humanity (though causality, a slightly different thing, is). Nonetheless, these doubts about determinism - even if you assume that the clairvoyants do know everything about the universe - cast serious doubts on the validity of so-called psychics.
Well, I don't know where that came from. Sorry for wasting your time everyone. 
Oh, btw, about Nostradamus:
http://www.snopes2.com/inboxer/hoaxes/predict.htm
This site explains that some of the quotes being posted here weren't even made by Nostradamus, and goes some way to debunking the myth of clairvoyance. Happy reading. 
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