Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. HBO Produces Documentary to Help Kids Understand 9/11 Associated Press NEW YORK - For students from elementary to high school, the Sept. 11 terrorist attack isn't a memory. It's history. A new HBO documentary that debuts on the event's 18th anniversary treats it that way. The necessity of her project, "What Happened on September 11," struck filmmaker Amy Schatz when a third-grade girl told her about a playdate where she and a friend Googled "Sept. 11 attacks." "When a child does that, what he or she finds are some pretty horrific images that are not necessarily appropriate for kids," Schatz said Tuesday. "So I felt a responsibility to try to fill that void and try to give kids something that isn't horrifying and kind of fills in the gap." The half-hour film debuts Wednesday at 6 p.m. A companion piece, focusing on the memories of former students at a high school near Ground Zero, premieres three hours later. .