Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Interesting discussion of the evolution of language

Interesting discussion of the evolution of language. Ruhlen does an good job in tying in his field of endeavor with DNA testing and archeology. He makes his work understandable to the non expert.It is helpful to use the maps below provided by the author, which provide large color maps of language location.(...)He spends a little too much time protesting how other people don't agree with him. He would have been better to simply address this issue once.I do think it likely that all language evolved from one source many years ago. But so much time has passed that is very difficult to establish the correct path of evolution. But paired with DNA testing a believable map of the expansion of both people and language is developed.