"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.
Titanium is present in most igneous rocks and their sediments, it is the 9th most abundant element in the Earth's crust and the 7th most abundant metal.
Old age is a time of humiliations, the most disagreeable of which, for me, is that I cannot work long at sustained high pressure with no leaks in concentration.
