Do all or most languages in the world descend from a single proto-language ? And if so what can we tell from linguistic analysis about the speakers of this ancient tongue ? These are the two questions at the heart of this controversial book and the themes clearly outlined by Colin Renfrew in his introduction. The theory of a Nostratic proto-language is not new, but the extremely detailed presentation of historical linguistic evidence provided here is. The lists of possible linguistic roots are not for the faint-hearted, but for serious linguists they provide real meat on which to chew, and, the publishers hope, provide a solid basis for debate.