Ancient Amazon Settlements Uncovered Thu Sep 18, 7:26 PM ET Add Science - AP to My Yahoo! By PAUL RECER, AP Science Writer WASHINGTON - The Amazon River basin was not all a pristine, untouched wilderness before Columbus came to the Americas, as was once believed. Researchers have uncovered clusters of extensive settlements linked by wide roads with other communities and surrounded by agricultural developments. The researchers, including some descendants of pre-Columbian tribes that lived along the Amazon, have found evidence of densely settled, well-organized communities with roads, moats and bridges in the Upper Xingu part of the vast...