I thought I'd pose an informal poll, possibly to become a top-level, in preparation for my article about How to Explain.

The question: on all the topics you consider yourself an "expert" or "very knowledgeable about", do you believe you understand them at least at Level 2? That is, do you believe you are aware of the inferential connections between your expertise and layperson-level knowledge?

Or, to put it another way, do you think that, given enough time, but using only your present knowledge, you could teach a reasonably-intelligent layperson, one-on-one, to understand complex topics in your expertise, teaching them every intermediate topic necessary for grounding the hardest level?

Edit: Per DanArmak's query, anything you can re-derive or infer from your present knowledge counts as part of your present knowledge for purposes of answering this question.

I'll save my answer for later -- though I suspect many of you already know it!