What Does 9/11 Mean to New Yorkers?

-Smoke pours from one of the towers of the World Trade Center Tuesday, September 11, 2001, after terrorists crashed a plane into the building.

Mary Marshall Clark, Director of the Center for Oral History Research at Columbia University, and the driving force behind the September 11th Oral Histories Project, talks about how 9/11 exists in the minds of those who lived through it, as told to her through thousands of hours of oral histories.