This book is by Leonard Susskind. He is a great astrophysicist. This book is about Quantum Dynamics, Quantum Chromodynamics, Quantum Mechanics, and String theory. This is a very hard book to understand for most people but it makes you think about how the universe came into existence and why. It might take a few minutes to read a page but it is worth the long reading time. I recommend this book to anyone interested in physics or Quantum Mechanics