I lived overseas and was doing some work for my job. It was in the evening there, and my wife came in to tell me that an airplane had crashed into one of the Twin Towers. I was sure she tuned in late to some hyper-realistic disaster drama, until I watched for a couple of minutes and realized it was actually happening. I was hoping for some explanation of why it happened. Just then, the second tower was hit and I realized it was a terrorist attack. Then there was the Pentagon and the field in Pennsylvania, and I spent the next several hours worrying that there would be more. I've been back in the US for many years, but will never know what the atmosphere was like here on that morning and in the days afterward. I did attend a beautiful ceremony to mark the 20th anniversary of the attack. I'd rather reflect on that ceremony than on the morning itself, so I'll stop here.