This photo taken on Sept. 11, 2001, brings back vivid memories for most Americans. But most high school juniors taking U.S. history this year don't share those memories. They were just kindergartners when our nation was attacked.
Rising 105 floors above the $START_URL$National September 11 Memorial and Museum;http://www.911memorial.org/$STOP_URL$ in New York, the new One World Trade Center under construction now dominates the lower Manhattan skyline and is slated to open in 2014.
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High school history teachers with strong memories of Sept. 11 are teaching students who might have been too young to remember that day in U.S. history. "They have no working memory of that event," says Joe O'Brien, 37,of Libertyville High School. "The teachers still have the emotions."