A survey of U.S. history teachers found they teach about 9/11 primarily on the date of the anniversary.
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HEALING SERVICE--President Barack Obama and first lady Michelle Obama attend the "Healing Our City: An Interfaith Service" at the Cathedral of the Holy Cross in Boston, April 18, dedicated to those who were gravely wounded or killed in Monday’s bombing near the finish line of the Boston Marathon.(AP Photo/Susan Walsh) by Julie PaceAP White House CorrespondentWASHINGTON (AP) — For President Barack Obama, one of his most wrenching White House weeks saw the fresh specter of terrorism and the first crushing political defeat of his new term, and the more emotional side of a leader often criticized for appearing clinical or detached.