I cannot believe that so many reviewers, presumedly Christians, would not make mention of the core evolutionary worldview presented in this book. One statement was presented as theory (some scientist believe birds were dinos) and the others were presented as fact - whales were first land animals, millions of years ago, this species evolved, etc. Also - the paragraphs for reading provide no real life skills or values but seem to be watered down history and science snippets - not much to take home here. The book is laid out nicely and the presentation is attractive. I am going to go another direction and try Vocabulary Vine, also available here. Fortunately, CB allows returns for 30 days. I greatly appreciate that.
This is a super series! We love it. Each Friday I give my sons an oral test on the definitions. I read a definition and they tell me the vocab word. I also use it for spelling. We go through the list until they can spell each word correctly. I would recommend this series very highly. You won't be disappointed.