A little Late...
I was listening to the radio, and there was this brilliant idea. To get some of the pain of your chest, or to see how others feel. Today (or next year) take a book you love, and would like to share with someone. If you want you can write a small message about your feelings on the attack. Then you take the book and leave in a public place, on a metro(subway) seat, on a park bench, for someone else to pick up. It will be a gift, and a way to share your feelings with the rest of the world. People have already done this in Florence, Montreal, I assume New York, and many other places in the world. I find this is a nice way to share your feelings, and share something special to you.