Of course, the Bible, and Luther's works too.
To Engineer is Human by Henry Petroski is a good book.
I love to read history, especially the history of science and technology. Science and technology are a huge part of what makes man unique in the creation, what separates us from the other animals. So, to read the history of science and technology is to read this history of man's uniqueness.
Human Accomplishment: The Pursuit of Excellence in the Arts and Sciences, 800 B.C. to 1950 by Charles Murray is a great book.
The Axemaker's Gift by James Burke and Robert Ornstein is a great book of history of science and technology. I've often wanted to have business cards printed listing my title as "Axemaker." But, I think I'll stick with my old title, "Electron Cowboy."
One book that I always encourage people to read is _The Corona Project_ by Curtis Pebbles. This is the history of America's (and the world's) first spy satellites. The thing I love about this book is to see just how advanced these satellites were -- advanced and capable way beyond what anyone in the civilian world thought possible -- and to see how presidents and other leaders were able to use this ultrasecret intelligence, so see the press and the public criticizing presidents for making decisions that were patently wrong, but were, in fact, clearly right if you only knew all the facts.