Lisa, Senes and media choices kind of go hand in hand. I like You-tube but only if they're very short segments, like 3-5 minutes, just to add a splash of variety and to make a lecture interesting. Students lose interest if it's any longer. Although PPT and Prezi can both provide opportunities for discussion, I reserve Prezi for when I want students write the main points. I'll use PPT when I want to expand on my discussion points and enter into the discussion. "Visualizing" sounds like a great technique. Barry Westling