"Ahu" are stone platforms on which many moai sit. There are 313 known ahu and 125 of these carry moai. The biggest, Ahu Tongariki is 220 m (720 ft), and had the most (15) and tallest moai.
We will have to continue to improve our human intelligence system-something that was, unfortunately, lacking in the years which led up to September 11. This is going to be a continuing process of change.
A little learning is a dangerous thing; drink deep, or taste not the pierian spring; their shallow draughts intoxicate the brain, and drinking largely sobers us again.