From time to time it may seem that the field of physics has completed its task, we understand the four (or one/two) fundamental forces, and the way that they interact with every day life, and that we even understand quantum mechanics and the dual nature of light. These things are very practical and we truly do have a near-complete understanding of them. Most of the questions that still remain in physics exist because of Godel's incompleteness theorum. His theorum stated that no system can be proved or understood without going outside the system. What this means is that 1+1=2 cannot be proved without using something outside of addition. This also applies to physics in that we cannot prove our model of the universe and of particle physics, because we ourselves cannot escape the limitations of particle physics.
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