It is now more than three years since the 9/11 attacks. But the collapsing towers, the smoldering Pentagon, the round bland face of Mohammed Atta still have an intense immediacy. Most people will always remember where they were when the news came through. If some of the details have faded, the mantra "the world has changed" seems as relevant as ever. The attacks on the World Trade Center and the Pentagon on 11 September 2001 had an immense impact...