This book was written nearly 50 years ago in the 1950's, so naturally some of the stories are incomplete with todays hindsight, but I wish I'd read this book 20 years ago. It is extremely well written, and full of fascinating anecdotes. Although I am familiar with many of the characters & stories, there was something new for me in every chapter, for example the insights into Oppenheimer in Germany before WWII. It would be wonderful if a revised version could be published incorporating the story of the Soviet Atom Scientists.