Instruct: Classify a given review into positive or negative sentiment.
Query: Prehistoric Research Fiction?

I can't say enough about this book. It is about two prehistoric stages of man (one is on its way out, one is on its way in). The lesser developed man ("the clan") finds a little girl from the more modern man whose parents have been killed in an earthquake. They take her into the clan and raise her as their own.The story itself is interesting and urges you to read on. But it's the research that's fabulous. I learned more about prehistoric times reading this entertaining work of fiction than I did studying it in high school and college. This is an excellent example of making good use of research.I highly recommend this book to prehistoric history buffs and anyone who simply loves to read good fiction.