Once in a generation – sometimes once in a lifetime – a singular event blindsides the entire planet. 25 years on, does the memory of the 9/11 attacks on New York's Twin Towers, the Pentagon and in Pennsylvania fade into history, or is it still as raw and vivid as on that sunny September morning?
Back then, the world was still processing the end of the Cold War. Western spies who had learned Russian suddenly had to take Arabic lessons. There was also the element of surprise compounded by the shock of non-state actors killing thousands on US soil. Each big anniversary since has been a marker of its own time.
