I do believe there is an attempt being made to 'take over the world'. That seems obvious to me. However, the use of A bombs as terrorist weapons has little to do with that. The most 'effective' place to use such a device is not necessarily in a crowded centre. People who think along that line are missing the point. I would look carefully at oil refineries, dams and in-land nuclear power plants. The explosion of a device that could be 'smuggled' into a country is limited. Terrorists would surely look for areas to use it where they can multiply its effects with secondary disruptions. I have always wondered why the Towers were chosen when there is a rich target just across the river in New Jersey.