Educators talk about how teaching 9/11's lessons have changed

Joshua Rovner has been teaching about 9/11 since the day it happened.

For years, Rovner would ask his undergraduate students what they remembered about that morning in 2001, he said.

Around 2007 or 2008, their answers started to shift from play-by-play recollections of where they were when the news broke, to more abstract descriptions of the fear or confusion they felt.