"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.
While teaching, I also worked undercover in the lower courts by saying I was a young law teacher wanting experience in criminal law. The judges were happy to assist me but what I learned was how corrupt the lower courts were. Judges were accepting money right in the courtroom.
