One Idea to Rule Them All

Catherine, I want to mention a book I mentioned to you in an email that I think people need to read. It's a book called One Idea to Rule Them All. The interesting thing about the book, Catherine, is that it's one of those books written with the very wide margins. So we can make notes. And what I've done in my marginalia is to reduce the concept that she's talking about to a principal.