.....how would you define "teaching"? This isn't a terribly important question in the grand scheme of things (at least not nearly as important as getting a handle on what learning is or what ought to be learned). Perhaps, a different way to ask the question is what do people typically called "teachers" (like myself, your favorite teacher in high school, etc) do in the classroom (very broadly understood as where classes meet) that can facilitate or impede learning?
What powers are "teachers" given and do we use them as well as we could to facilitate your learning (and learning of what)?
Like I said, this may not be a hugely relevant question, but I'd be curious to hear/read your thoughts.