So do you also think that as a school teacher you learn more by asking your students questions to which you truly don't know the answer, even if there is one possible one on your mind? Had you this learning experience when the students came up with answers you would never have expected? And how did it feel for you?

Yes, I certainly think that if you have a question and no answer to it you should first ask a child what does he or she think :)
I wasn't a regular teacher, so I didn't have to stick to a particular agenda. So I did different training with the children and we spent a lot of time discussing different subjects. I used to write down the answers that most fascinated me. At the end of the first school year (I spent two years with them), I created hand-made books with all their thoughts inside and I gave it as a present to every parent :) You and me, we think alike, you know :D

I agree with you. It is difficult to ask the right question in the right way at the right time. I am faaaar of being good at it :/