It's the end of the world as we know it. Or is it?

So I'm sure all of you have heard of the theories of the end of the world. The question that remains in the back of all our minds is, are they true or just the product of human imagination. I have read alot of the Nostrodomus predictions, most of them are just dribble and cryptic. I have read revelations in the bible, and even though I don't believe that the bible has much useful material, I think that there is some interesting things in it. The Mayan calender ends on December 21, 2012 and most people think that this date is when the world will end. How do we know, maybe they just got bored with continuing the calender for over a thousand years and said "that's enough." What about the scientific explanation about the alignment of the planets to a certain point in our galaxy that only happens once in 54,000 years. This explanation dictates that the polarity of the earth will be reversed, possible making all of our electronics useless. If this happens then it is possible that the Nostrodomus prediction of man going back to sticks and stones could be fulfilled. All of these theories and predictions are fun to entertain and even for some of us exciting, there is still the theory that aliens will come to our aid in the waning years of the earths life. Though this theory sounds like a bunch of bullshit to some people, it is the same as all the others. Truth is, we don't know if any of this is going to happen, if at all. I however would like to hear what everyone thinks on this subject and for people who want a challenge here is the test on your observational skills. Watch the movie "Knowing" with Nick Cage and tell me what the underlying message is in that movie. I will give you a hint, it's a theory that is well known to a select group of people, and the movie secretly gives hints to an actual theory. If you figure it out then you are well versed and open minded. If not then don't worry cuz your safe in your little box.