What should teachers be discussing with their students to mark the 10th anniversary of the Sept. 11, 2001, terrorist attacks? Asks the Washington Post. It may seem like a simple question, but a report just issued [1]by the nonprofit Thomas B. Fordham Institute explains why it has become a complicated issue—and why some of the lessons being given by teachers across the country are missing the point. Chester E. Finn Jr., the author of the introduction to the report, which is entitled “Teaching about 9/11 in 2011: What Our Children Need to Know,” writes that too many teachers are giving lessons that give short shrift to the history of the event and the way American society has changed as a result…