Excellent! this book is way more interesting and engaging than the title suggests. I only picked it up because I have read L. Sprague De Camp's Conan books and wanted to see what he offered in way of non-fiction. I am so glad that I did!
With this book, you get a broad view of engineers and the inventions that forever changed and advanced human civilization. He gives plenty of historical reference to give a clear time line in your mind of these progresses. A great resource for any history or engineering buff.