Hi Deborah: Personality creates an atmosphere (dull, boring, sleepy) or it can a classs can be presented with enthusiasm, excitement, passion, even zeal. If students sense this is genuine, it has an effect of an upward flow, that is, a drawing in of all participants into the lecture or discussion, or presentation. Think of movie trailers. They capture the audience in a 30-60 second period and (hopefully) make people whisper "That looks interesting". Sincerity with the entusiams is what makes it believable. Regards, Barry