They were the healers, teachers, and writers, the "wise ones" of Nahuatl-speaking cultures in Mexico, remembered in painted codices and early colonial manuscripts of Mesoamerica as the guardians of knowledge. Yet they very often seem bound to an unrecoverable past, as stereotypes prevent some from linking the words "indigenous" and "intellectual" together. Not so, according to author Kelly S. McDonough, at least not for native speakers of...