"What Happened? The Story of September 11, 2001." Produced by The American Psychological Association and Nick News, the guide has several activities which introduce students to the events that unfolded that dreadful day. Why not start with the video, "Nick News with Linda Ellerbee: What Happened? The Story of September 11, 2001". I've embedded it below for your convenience. Thank you to my colleague Brenda for sharing this link on Facebook!