Lest it slip by unnoticed with everything else we have on our minds, let us observe a moment of virtual silence for those who died four years ago on this day, a day that dawned similarly clear and sparkling and ended in a haze of smoke and ash.
Let's take a minute to stare out the window or put your head down on your desk and, whether or not you believe in god, pray for peace on earth.
There's an amazing website, Storycorps, that has recorded the memories of people mourning their loved ones who died on that day. You probably won't be able to listen to more than one (I couldn't go on after listening to Richard Pecorella), but it seems like a good thing anyway.