On a crisp September morning nearly five years ago, terrorists hijacked four American airliners in a coordinated suicidal attack on America.
Within hours, thousands of Americans were dead, New York City's two tallest buildings were gone, the Pentagon in Washington was ripped open and a stunned America was watching helplessly - fearfully - as images from ground zero filled their TV. screens.
In the days weeks and months that followed, the events of 9-11 would change America in small and dramatic ways, from "news ribbons" that began to appear on TV. broadcasts to massive American military campaigns in Afghanistan and Iraq.
"9-11 changed everything" we said after the attacks. Five years later, American troops remind in Afghanistan and Iraq, the world trade center site is still a gaping hole in lower Manhattan, and you...? What about you?
Has your life changed because of 9-11? Did the collapse of the twin towers send shock waves that ripple still in the way you live, work or behave?
My story to follow your responses.