decisions we need to make ahead. what are some facts that you have come across that seem consistent in the school shootings that you have looked at? >> well it seems sometimes this is a new phenomenon. that it struck in the late '80s and went through the '90s but in fact the first school murder was in 1927. it was a school board member who detonated the local elementary school in bath township, maine, killing 37 students, children, elementary schoolchildren, and seven adults. so that makes it the single most deadly school massacre ever in america, far more than virginia tech. jenna: still, no matter how, we look at the frequencies, whenever there is a school shooting it rocks us at the core. so now we're at this question about, what should we do? and that's, that's a big question for us today. but when you think about your research, what rises to the surface? does some other patterns that you might see in school shootings? >> yes. the fbi spent a long time