Speak is a life history of humankind's defining characteristic and most valuable asset." "Distinguished Swedish scholar Tore Janson takes the reader on a voyage of exploration through the changing patterns of the world's languages, from prehistory to the first civilizations, ancient Egypt to ancient China, imperial Rome to imperial Britain, Sappho's Lesbos to contemporary Africa. He shows how language evolved from primitive calls, and discovers the links between the histories of societies and their languages.