Salt: A World History. It is quite interesting! http://www.amazon.com/Salt-World-His.../dp/0142001619
I read all sorts of stuff. I read a lot of murder mystery and government conspiracy stuff plus lots of historical fiction.
I think you'd really like J. Maarten Troost. He has a few books that are really good.
The Sex Lives of Cannibals; Getting Stoned with the Savages; Lost on Planet China.
Also one of the BEST books ever is Stiff: The Curious Life of Human Cadavers by Mary Roach. It is utterly fascinating and gross at the same time. She also does a really good job of being respectful of the dead and being funny too.