| http://www.w3.org/ns/prov#value | - While external forces???changing climate, invasions, and the diffusion of people and ideas???are all given explanative power to affect change, the authors are most interested in internal change: how people choose new leadership forms, how they adapt their cosmologies to change, and why after more than 6,000 generations, humans suddenly invented all the forms of inequality we know today in just mor
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