Informative and Poetic. Gregory knows his subject extremely well and knows how to explain it well to an audience that doesn't necessarily have near the academic pedigree in the field that he seemingly does. Ostensibly a story about the space rocks that land on earth, this tale is part history, part chemistry, part theoretical astrophysics, and a whole lot of detailed yet understandable explanation of how all of these fields interact as it relates to the subject at hand. I learned more about chemistry from reading this book than I *ever* understood from my high school chemistry class. Very much recommended. ( )