Jean-Louis Dessalles explores the co-evolutionary paths of biology, culture, and the great human edifice of language, linking the evolution of the language to the general evolutionary history of humankind. He provides searchingly original answers to such fundamental paradoxes as to whether we acquired our greatest gift in order to talk or so as to be able to think, and as to why human beings should, as experience constantly confirms, contribute information for the well-being of others at their own expense and for no apparent gain: which if this is one of language's main functions appears to make its possession, in Darwinian terms, a disadvantage.