All of us recall where we were 13 years ago today. A once-in-a-generation set of events that changed our world and continues to influence it today. When we simply say "9/11," it creates a unifying meaning we all understand.
Vivid images — airplanes impacting into buildings, national icons from the New York skyline tumbling, and the Pentagon engulfed in flames. Then the U.S. and eventually the Western world's air transportation systems being completely shut down.
For one of those rare moments in our history, many of us felt our nation's security was directly threatened. What would tomorrow bring?