This book is about 'back room boys' a phrase coined during the war for those mostly anonymous people who did amazing research and produced much of the technology which helped win the war and create the modern world. The book isn't quite what the title would suggest. It is really six long essays on six different areas of technology without any overarching link which would make the book. Having said that, it is still an interesting read. Each section is well researched and well written. If you are at all interested in science - and the detail is such that you don't need to be a boffin to understand it - then this would make an interesting diversion.