I am not a mathematician, so I always used to wonder about following. "I never heard Einstein conducting any experiments, But how he predicted the physics properties the way it is explained in Relativity Theorems. These are some of the breakthroughs of that time, But without the intuition from the experiments how Relativity Theorems are developed? " At the same time, How it required experiments to develop the theories related to invention of the transistor, Like a new branch of Quantum Psychics to account for the odds they observed. Also, How theoretical physics related to practical physics, how they evolve ? Can anyone point me to the resources to develop this mathematical intuition. I could be asking a totally stupid question here.