TUCSON, Arizona, June 21 (TNSres) -- The University of Arizona issued the following news release: Some 800 years ago, a small band of Polynesians sailed thousands of miles across the Pacific to settle one of the world's most isolated places - a small, previously uninhabited island they named Rapa Nui. There, they erected hundreds of "moai," or gigantic stone statues that now famously stand as emblems of a vanished civilization. Eventually, their numbers ballooned to unsustainable levels; they  more