Surely You're Joking Mr Feynman: Adventures of a Curious Character

by Richard P. Feynman

I’ve very often made mistakes in my physics by thinking the theory isn’t as good as it really is, thinking that there are lots of complications that are going to spoil it—an attitude that anything can happen, in spite of what you’re pretty sure should happen.

I understood that to sell a drawing is not to make money, but to be sure that it’s in the home of someone who really wants it; someone who would feel bad if they didn’t have it. This was interesting.

I had a certain psychological difficulty all the way through this period. You see, I had been brought up by my father against royalty and pomp (he was in the uniforms business, so he knew the difference between a man with a uniform on, and with the uniform off—it’s the same man). I had actually learned to ridicule this stuff all my life, and it was so strong and deeply cut into me that I couldn’t go up to a king without some strain.

It’s a kind of scientific integrity, a principle of scientific thought that corresponds to a kind of utter honesty—a kind of leaning over backwards. For example, if you’re doing an experiment, you should report everything that you think might make it invalid—not only what you think is right about it: other causes that could possibly explain your results; and things you thought of that you’ve eliminated by some other experiment, and how they worked—to make sure the other fellow can tell they have been eliminated.

The first principle is that you must not fool yourself—and you are the easiest person to fool.

it uncovers the clues that the rat is really using—not what you think it’s using. And that is the experiment that tells exactly what conditions you have to use in order to be careful and control everything in an experiment with rat-running.