September 10, 2011
In this Tuesday, Sept. 11, 2001 file photo, Chief of Staff Andy Card whispers into the ear of President George W. Bush to give him word of the plane crashes into the World Trade Center, during a visit to the Emma E. Booker Elementary School in Sarasota, Fla.
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A decade later, what happened on Sept. 11 still resonates for much of the country. Even more Americans now say the horror of that day changed their lives.