" This book is a through and frequently tedious exploration for a theory of time. Pay close attention to the word "Quest" in the subtitle. This books poses many questions that don't have answers yet and instead focuses on the various theories that currently exist. The book starts with an introduction to possible definitions of what time is, the role of entropy, and the Second Law of Thermodynamics. With that foundation it dives into microscopic constituents, macroscopic systems, and quantum mechanics before finishing off with inflation, the reversibility of time, and multiverses. I found as I went along the tractability became further removed from everyday life and ended up almost entirely in the realm of theoretical physics and dare I say philosophy. If you are interested in understanding the current state of thinking about what time is, the origins of the universe, and similar topics the author's writing is excellent and the copious footnotes helpful. It just felt like it took an eternity to read. "
— Daniel, 1/24/2014