"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.
Just as the Security Council was largely irrelevant to the great struggle of the last half of the twentieth century - freedom against Communism - so too it is largely on the sidelines in our contemporary struggles against international terrorism and the proliferation of weapons of mass destruction.
