Most of his recent contributions have been in the area of "social stratification and the political economy of the Maui Kingdom in Hawaii, and the rise of complexity in early Iron Age Sicily."
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This region, alongside Mesopotamia (which lies to the east of the Fertile Crescent, between the rivers Tigris and Euphrates), also saw the emergence of early complex societies during the succeeding Bronze Age.
By 2020, they have created a complex society on the Moon, where the boppers developed because they depend on super-cooled superconducting Josephson effect circuits.