"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 know what your childhood was like, but we didn't have much money. We'd go to a movie on a Saturday night, then on Wednesday night my parents would walk us over to the library. It was such a big deal, to go in and get my own book.
Better understanding of the natural world not only enhances all of us as human beings, but can also be harnessed for the better good, leading to improved health and quality of life.
