First you guess. Don't laugh, this is the most important step. Then you compute the consequences. Compare the consequences to experience. If it disagrees with experience, the guess is wrong. In that simple statement is the key to science. It doesn't matter how beautiful your guess is or how smart you are or what your name is. If it disagrees with experience, it's wrong. That's all there is to it.
Richard P. FeynmanThe highest forms of understanding we can achieve are laughter and human compassion.
Richard P. FeynmanI think a power to do something is of value. Whether the result is a good thing or a bad thing depends on how it is used, but the power is a value.
Richard P. Feynman