Karl, I think it's true, most of us respond to visual and auditory sensory stimulation. That said, as for student learning, lecturing alone is the least effective way for students to learn, although it it is the most convenient. On the other end, the most effective way students learn is by teaching others. Using a variety of media is effective to different degrees to different students. There was a time where I used a lot of video tapes, where now, that has diminished to a fraction of what it used to be. That's because I've learned that watching video is static, and without some sort of engagement, although the information is useful, students retention of video material will be low. Barry Westling