host: let's go to bonnie in sioux center iowa, and educator.aller: i would like to make three observations about education and how it has changed since i was a student. the first change would be, there's more stressors that come from the school environment itself. i was a student in two states and have taught in three states, wisconsin, florida, and california, and now i am a substitute teacher in iowa which is where i grew up. when i stopped in florida, the fear and the actuality of school students are stressors. the school from which i graduated where i sub now recently had an active shooter drill. that was something that never would have occurred to us in the 1960's and 1970's. the real or possible threat of violence is very traumatic. the second thing that is a big change, i would like to know how many of people who are of my generation can rattle off the names of multiple substitute teachers. i love substitute teaching but the fact is not only our students donned a lot more, so our teachers. that expectation that my teacher will be there b