i think everyone might have the ability to be psychic, well, almost anyone, because maybe mentally retarded people can't.
I think our brains know the future. i think past present and future is a video tape in your head. de ja vu is a small snippet of that movie. so what prevents us? Our subconscious. Deep down we are very very scared of the future, scared to see how we, our friends and relatives will die. this fear is natural and immense and engraved in our subconscious. So the subconscious prevents the other part of your brain from playing the tape for itself. i think if you become really, really calm and really believe in your psychic powers, you may very well be able to unlock them. now we have the problem: if you see the future and it is bad you would like to change it, logically. But first we have to think which future will you see? there are millions of futures to see, because there are billions of people who each have their own unique future. im guessing you can only see one at a time, probably only the one you focus on. I think because the chemicals in your brain have always been in the universe ( or since they were created ) and will always be ( until destruction of the universe and them ), they sort of might know the past and present and future. Those chemicals that are theoretically faster than light ( if they do exist ) ( they are called tachyons ) might be inside the human brain.
I have once tried a psychic exersize. I took 3 cards ( same size and colour ) and drew a circle, square and triangle on each seperately. i shuffled them in my hands with my eyes closed and tried to predict which one i would see every time i turned a card around. i actually had quite a success rate in predicting the right future results. but i noticed that if my concentration lessened just a little i soon predicted the wrong card. concentration is really really important.
this is all just theory ( except 4 the experiment ) so no one should take me too seriously. The exersize was very "draining", i dont know if it was very good for me. if you try this stuff at home be careful, it is unknown territory. If any real psychics want to comment or help me, please feel free to do so.