If I did not know something, I found out. But en route, I discovered that when someone threw me a difficult question, it was no sin to admit that I didn't know. The sin came in the next class when I still didn't know. After I had researched some question, I always answered that student in the next class and practically made him take notes on my answer and my source. Slowly I learned a better way.
Student asks question.
I'm not sure, but I'll tell you on Friday. I'll give you a nickel if you find out before I do. The very first time I tried that, the student accepted my challenge. She came back to class and read off her notes. Then I read off mine.