To wayne:
NO, i didn't said it is definitely possible, i didn't said people didn't tried it, i just wanted to say that science is about proving or disproving a theory and so far science wasn't able to accurately confute the possibility of having precognitions (and could't confirm - true).
also, it is sure that people are not the same and if there are such things as precog dreams or thoughts, they wouldn't appear at the same extent amoung everybody.