like pat just said after he read the article,
i guess the ancients had alot more time on
their hands than once thought. they couldn't
spend as much time doing "survival" things,
like hunting, and still have time to create
so many structures out of these huge stones.
Actually when you see all those very large efforts like Egypt, Peru and Pre Columbian Mexico, to name three, there was a well organized order of Directors, Workers and Providers to the Directors & Workers.