I recently toured The B Reactor at the Hanford Nuclear Site in southeastern WA. I've also been to Los Alamos. This book greatly increased my understanding of that era and my understanding of what I saw and heard on these tours. What these scientists, and thousands of workers, accomplished in such a short time is almost unbelievable. On the 70th anniversary of the dawn of the Atomic Age, that shaped the lives of billions, this book is essential reading.