Early field experience teaching a Biology lesson (Genetics) for a colleague.  The year is 2000.  The school is Gary Lew Wallace High.  The time is 5th period directly after lunch.  The students seem listless after a heavy meal and the presenter (me) does not get the students more actively involved with an otherwise relevant lesson.  In addition, I am having them read aloud.  Not a good idea when it is obvious many of the students cannot read.