Born after the terror attacks, a generation of young people wonders – What happened on 9/11? Why did it happen? What was its impact on our country and the world? Exploring these and other questions in a kid-friendly way, HBO Family’s latest documentary is an introduction to the events of 9/11. What Happened on September 11 is directed and produced by Emmy-winner Amy Schatz (HBO’s Song of Parkland, The Number on Great-Grandpa’s Arm and An Apology to Elephants) in collaboration with the 9/11 Tribute Museum.