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Peru: On a roll with water wheels

In Peru, ancient Inca water systems inspire a new wave of hydroelectric technology.

Peruvian water power
A view of Tipon, a 500-acre, self-contained, walled settlement that served as an estate for Inca nobility, in Peru. Tipon was an Incan hydraulic engineering building, designed to be visually and functionally in harmony with the natural environment.(Jamie Razuri/AFP/Getty Images)

http://www.globalpost.com/dispatch/the-americas/101020/peru-hydroelectric-technology-inca-civilization