If You Can’t Explain It Simply, You Don’t Understand It Richard Feynman won the Nobel Prize in Physics for work so complex that only a handful of people in the world could fully understand it. Yet he became equally famous for something else: his ability to explain quantum mechanics, particle physics, and electromagnetic theory to complete beginners with such clarity that they would walk away understanding concepts that had previously seemed impenetrable. His secret was not just that he understood physics deeply but that he had developed a systematic method for testing and deepening his own understanding through the act...