Thanks for the compliment. Yes, it was the few teachers that did the same for me that inspired me to become a teacher. From the teacher's side, it is a very risky thing to open up discussion when you don't know where it will go. You lose control in the moment - but in the end you gain students' respect. It's also a good lesson to show your students that you don't know everything. And, in fact, you are still a learner yourself. Who wants to have a conversation with a "know-it-all?"