Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent book - a review by Eli (age 7)

Dragonology is a great book. The way the book shows all the samples, explains different facts about dragons and mostly the illustrations are the best I have ever seen in that type of books. The book has so much interesting information that it took me a really long time to finish it completely. I like how this book includes secret letters and books which is why I already bought three other books in that series.