I was first introduced to the concept of “known unknowns” and “unknown unknowns” in a sort of pseudo-group therapy practice in the ’90s. A decade or so later, the idea broke into the public imagination with “There are unknown unknowns”, and while the idea has been around a while, it doesn’t seem to have a name. I call it the knowledge quadrant. The idea is that, well, there are things you know, and things you don’t know. And you can further break down the things you don’t know into things you kn...