In everyone's life there are certain events, the circumstances of which, will stay lodged in your memory for ever. When the anniversary of that event occurs you will immediately recall where you were, what you were doing and any other details of the time.
My first such event was the assassination of John F. Kennedy. There have been others, equally unpleasant. The most recent is the terrorist attach of Sept. 11, 2001, eighteen years ago. The question that many will want to know is could it happen again. Well, I suppose it's conceivable but I highly doubt it. Security measures that are obvious and that we don't even know about have been put in place to prevent such a thing. Osama Bin Laden, the master mind of the attacks, is gone but there will always be someone to take his place. We simply-or not so simply-need to cut him off at the pass so to speak.
In the mean time it's important to remain alert and not let complacency overtake us. Never forget.