Classroom discussions have been a staple of teaching forever, beginning with Socrates. I have taught using discussions, been a student in discussions, and observed other teachers' discussions thousands of times -- at least. Some have been boring, stifling or tedious enough to put me to sleep. Others have been so stimulating that I was sad to see them end. The difference between the two is obviously how interesting the topic is, but equally important is the level of student participation.