What I am going to tell you about is what we teach our physi... - Richard Feynman, QED: The Strange Theory of Light and Matter

"What I am going to tell you about is what we teach our physics students in the third or fourth year of graduate school... It is my task to convince you not to turn away because you don't understand it. You see my physics students don't understand it... That is because I don't understand it. Nobody does."