I have read this book many times and have given it as a gift to many others. I'm a chemistry teacher as well as a history of science buff, and in this book, Sachs re-creates the history of major scientific discoveries as a teenager in WWII era England. The book was suggested to me by a psychologist friend who was interested in that aspect of Sach's writing. She enjoyed the first 30 pages which dealt more with Sachs as a psychologist, and then passed the book on to me because she was uninterested in the rest of the book dealing with science. I found the first 30 pages boring, but loved the rest of the book.