Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A Mind Opener!

I came across a Brian Greene lecture when I was researching the theory of a universe beyond the three dimensions we see. I really enjoyed the lecture and decided to read this book which turned out to be extremely informative. At times it can get hard to understand especially when you get into the quantum mechanics chapters, but it is still a great book to challenge what you've been taught your entire life about science and physics. He uses great analogies to explain the speed of light, relative motion, the behavior of particles and several other concepts. Analogies can seem a little ridiculous sometimes, but for the most part they are exceptional. Fantastic book!!!