It's a common misconception that the Dunning-Kruger effect is just about dumb people not knowing they're dumb. In fact, it's about something we all do - overestimating our knowledge and competence in areas where we have little of both. It's worth recognizing the distinction because everyone is subject to the Dunning-Kruger effect when we're out of our depth in some area and there are a lot of "unknown unknowns".