But then i thought, two hours of this is going to be a mighty long sermon ! So i started looking for some activity to get them to do - and that is where you came in. I was very impressed with the method that you used for the midterm presentation in 102: getting pairs of students to explain their work to each other, and then getting the other of the pair to do the introduction and the explanation of the work. I thought i would try something on that order. I decided to use the topic of a beloved teacher.