> It is impossible to do physics by thought experiments. Thought experiments are an important tool used by many brilliant physicists when it is not possible to

> It is impossible to do physics by thought experiments. Thought experiments are an important tool used by many brilliant physicists when it is not possible to carry an actual experiment yet. Their usefulness is in the opposite of what you say: sure, they can't prove a teory correct, but they can point out potential problems by finding contradictions. As an example, here you can find a famous and very important thought experiment in the field of thermodynamics: https://en.m.wikipedia.org/wiki/Maxwell%27s_demon https://en.m.wikipedia.org/wiki/Maxwell%27s_demon