For many who stood staring at their televisions in disbelief 17 years ago, the memories of the terrorist attacks that took place on Sept. 11, 2001, are permanently etched in their minds.Ask just about any adult, and they will be able to tell you exactly where they were, and what they were doing the very moment they heard the news about the attacks on the Pentagon and the Twin Towers or the crash of United Airlines Domestic Flight 93 in Sommerset County, Pennsylvania.