"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.
I don't remember any sibling rivalry growing up, because by the time I was really conscious, Tom was going away to college. My relationship with him, which is a very close one, really developed in more recent years.
