My background is Mathematics. I'm thinking about learning Physics as a hobby. I know a little Physics from courses and research I did in college. I rented from the public library a few weeks ago a PBS documentary on Einstein because I wanted to have a basic idea of his life and theories. The video was very critical of Einstein. It said that shortly before Einstein died, Quantum Mechanics had become a popular theory and Einstein had desperately tried to unify the field of Relativity and Quantum Mechanics but had failed to do so. They said that if Einstein was alive today to see Quantum Mechanics, he might've changed his mind about many things.