Both Quantum Physics and Relativity have had great impacts on the world of science. Yet, strangely enough, the two, at least according to Einstein, did not mix very well. But first, an overview of each is needed.
The Quantum revolution has to be credited to Max Planck. He stated that electromagnetic magnetic radiation, such as light, x-rays, gamma rays and more, could not be emitted from an object at arbitrary rates. That is, the radiation emitted from any object cannot be infinitely small. In place of this, he proposed that all electromagnetic radiation traveled in small packages called quanta. This made the amount of radiation an object could emit finite, both with a maximum and with a minimum.
The Special Theory of Relativity is a description of what occurs to particles when they approach the speed of light. Basically Einstein stated that the speed of light was constant and that that nothing a solid could reach or exceed it because it would take an infinite amount of energy to do so. Einstein also described with his famous equation, E=mc2, the relationship and relativity between mass and energy, where (energy) equals (mass) multiplied by (the speed of light squared). The General Theory of Relativity was basically a new view on the function and creation of gravity. Einstein stated that gravity was the effect of massive objects on space-time. This would create curvatures in the universe, as would a ball on a trampoline. Proof for this theory was obtained during a solar eclipse. Comparing the positions of stars during the eclipse and their same positions afterwards accomplished this.

The main difference between the Quantum Physics and Relativityis that Relativity is basically predetermined, or in other words, there are no deviations from the laws. Quantum Physics on the other hand, relies on probability. For example, the uncertainty principle states that you cannot know the exact position and velocity of a particle; the more you know one, the less you know the other and vice versa. The probability factor here is evident. One can know exactly where a particle is, but he or she will not know where it is going. Or, one can know where the particle will be, but he or she will not know where it is coming from. This is apparent only on the quantum level, and cannot be done with, for example, a ball. The slight differences in the ball's position and velocity will be almost immeasurable. It was because of this probability Einstein did not believe Quantum Physics was a correct description of nature. He went on to say "God does not play dice." However, many experiments have been conducted to prove otherwise.