Thanks for sharing that. The well-crafted structure is a fitting tribute. When I got the news about 9-11, I pointed to a picture of the Challenger disaster that was on my board and told my class that in every life there will be those moments that are forever burned on your memory. Though I'm too young to remember JFK, I remember the assassination attempt on Reagan and the Challenger disaster. The last few years have added a few more of those memories.