Here's one example of this kind of phenomenon. If you really want to understand a question, write a paper about it. It's easy enough to read five or ten research papers in an area, and if you do that thoroughly, and write extensive notes as you do so, you'll start to feel that you understand the area and the issues involved. However, if the way you learn is much like mine, when you try to start writing you will reali…
But despite the clear efficacy of this method, it never occurred to me to do it on my own, just to learn something. It's a lot of work and somewhat painful, but I suppose a more complete mastery always is.