An enormous Waterway system built 5,000 years ago is rewriting the history of early Chinese engineering. Experts found a series of high and low dams, as well as levees, that they say is one of the world's largest and  oldest known hydraulic engineering systems. Pictured is a pier at Bianjiashan found during excavations, with wooden stakes still preserved, forming a 'T' shape [Credit: PNAS]The recently excavated dam system was...

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