Forget small nomadic tribes and pristine jungle: the southern Amazon was likely covered in a network of large villages and ceremonial centers before Columbus. Geoglyphs in the southern Amazon are evidence of a once-thriving population. Photograph courtesy of University of Exeter ------------------------------------------------------------------------------------------------------------------------ Before Spanish invaders conquered South America, sparse groups of nomadic people clustered around the Amazon River, leaving the surrounding rain forest pristine and untouched. Or did they? New research suggests a very different story—an Amazonian region peppered with rain forest villages, ceremonial earthworks, and a much larger population than previously thought. The research, funded in part by the...