Instruct: Classify Amazon reviews into positive or negative sentiment
Query: a very useful book to keep

I've looked at a ton of books during my pregnancy, and of all of them, the two most useful, helpful ones so far are What to Expect When You're Expecting and this book, Raise A Smarter Child by Kindergarten. I think that I will return to this book again and again. In chapter 3 alone, there are over 30 activities to do with your child, with clear explanation of what to do as well as how it helps your child. The author's narrative throughout the book is not preachy and he acknowledges his own bias, but presents clear, factual support. This was definitely not money wasted (especially since at the bookstores you pay retail!).