This week is an interesting video from Dr Eric Mazur, professor of Physics in Harvard. In this video, Dr Mazur explains how he came to abandon lecturing for peer instruction. Although he thought he was doing an excellent job of teaching by looking at student evaluations, he realized that students actually understood little of the physics principles he was teaching. Trying to explain them again to students was fruitless. In a desperate effort, he told students to discuss those concepts among themselves. What he found was that students were better prepared to teach peers complex ideas since they had only just mastered them. He thus now only teaches through peer instruction, guiding students into learning.