Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Pretty Easy to Understand

One of this book's authors is a professor at my university. While he himself did not teach my physics class, he definitely conveyed our school's philosophy of "learn by doing" through the use of numerous pictures, diagrams, and straightforward exercises at the end of each chapter. I thought the book explains the general ideas and concepts of physics very well, without requiring a calculus background to understand the material.