Tamara is writing a paper about reactions to the tragedy that occurred at the Twin Towers on September 11, 2001. She interviews ten of her classmates and asks them to remember that day. She is surprised to learn that nearly all of the students she interviewed offer very detailed, vivid accounts of where they were and what they were doing when they first learned of the terrorist attacks. Tamara has discovered that most of her classmates have ______ of September 11, 2001.