Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A rip off

I strongly recommend AGAINST buying this book.At 9x6, 110 pages, this is an awefully little book. It contains about 21 pages of text, and in the rest of the book are 162 black and white photographs.The text is over simplified, with only seven references listed at the end. While this may be good enough to pass as a chaptor in a more comprehensive textbook, its merit doesn't justify as a stand alone book.The photos are of very poor quality. By "poor quality" I mean both unclear (low contrast, grainy) and lack of illustrative value (what man with his right mind would demonstrate "cherry red" color in black and white? But the authors apparently think that's a good idea).I would classify this book as a $3.99 "pulp science". Buy it and you'll regret it. You have been warned...