even though einstein thought of many ideas that helped scientists understand the world much better, he disagreed with some scientific theories that other scientists liked. the theory of quantum mechanics discusses things that can happen only with certain probabilities, which cannot be predicted with more precision no matter how much information we might have. this theoretical pursuit is different from statistical mechanics, in which einstein did important work. einstein did not like the part of quantum theory that denied anything more than the probability that something would be found to be true of something when it was actually measured; he thought that it should be possible to predict anything, if we had the correct theory and enough information. he once said, "i do not believe that god plays dice with the universe."