My point is that you cannot know (as we understand right now) the information necessary to be able to determine future and past states of everything in the universe. (or anything at all) The Heisenberg uncertainty principle, one of the fundamental relationships in qmech, states that as you increase your knowledge of the location of a particle, you will be less certain of the momentum of the particle. This doesn't really make all that much sense at first until you understand that particles are both waves and particles at the same time. That doesn't make sense either, but when you combine the two, you can view the "particle" form of a particle-wave as a high knowledge of the location of the particle, while the wave form is when there is greater knowledge regarding the momentum of a particle. The first part hopefully makes sense, but the second part may be a little confusing without some more information. A particle's wavelength is inversely proportional to its momentum. Therefore knowing the wavelength of a particle is equal to knowing its momentum. The summary of this is that the more you try to pinpoint a particle-wave's location, the more it acts like a particle. The more you try to find the momentum of a particle-wave, the more it acts like a wave.

Qmech is the best answer we have right now. Its really kind of an unanswerable question.