If it disagrees with experiments, it's wrong

Richard Feynman on how to find a new law:

“If it disagrees with experiments, it’s wrong. In that simple statement is the key to science. It doesn’t make a difference how beautiful your guess is, it doesn’t matter how smart you are, who made the guess or what his name is. If it disagrees with experiments, it’s wrong—that’s all there is to it.”

Via Feynman: The Key to Science