"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.
Every child should have a caring adult in their lives. And that's not always a biological parent or family member. It may be a friend or neighbor. Often times it is a teacher.
Over the eons I've been a fan of, and sucker for, each latest automated system to 'simplify' and 'bring order to' my life. Very early on this led me to the beautiful-and-doomed Lotus Agenda for my DOS computers, and Actioneer for the early Palm.