“The first principle is that you must not fool yourself—and you are the easiest person to fool. So you have to be very careful about that.”
Richard Feynman, Cargo Cult Science (1974) · Caltech commencement address · read it
Kept because every bias on this site is a way of fooling yourself, and Feynman names the fix before the problem. The rest of the talk is about what he called bending over backwards: reporting what might make you wrong, not just what makes you right.