The research behind this book is amazing. The author has stuffed this book with many little facts that enrich the scenes. For example, there is a chapter in which Einstein and his rival Niels Bohr first meet and walk together through Berlin while they dispute physics. It sounds arcane, but the research Bolles did brings the story alive. First, it is plain that there is no record of what the two men actually said. Bolles does not make up dialogue, but he presents the two scientists' positions in back-and-forth form so it feels like a debate. There are many scenes in the book where Bohr and Einstein dispute in this manner. The research necessary to understand the changes in their arguments at different times must have been great. On top of that, the author includes descriptions of Berlin while the two men walk through neighborhood after neighborhood. Added to this is an account of the absentmindedness of the two as they ignore the city around them. The result mixes science, humor, and 1920's Berlin into a scene that is as sharp as something in a movie. And there is scene after scene like this. The catastrophe of inflation that destroyed everybody's savings (including that of Einstein's wife) never sounded so hellish. I noticed that one Amazon reviewer complained about this book's research, but that is unfair. We get data from old guidebooks, photos, diaries, letters, newspapers, science journals, and many other sources. These details are seamlessly sewn together into one grand fabric.