 Professor, tell me, though, about how you navigate in the book the limits of free speech, not just historically, but I know, for example, there's a chapter about what we've all heard growing up, right? You can't yell fire in a crowded theater. That's not considered free speech. What did you sort of discover in writing the book about navigating? We don't yell fire in a crowded theater, but certain political speech that can fire people up maybe too much.