Since you like science and readable nonfiction--I've recently enjoyed the following:
Beyond Oil: The View from Hubbert's Peak by Kenneth S. Deffeyes (he's a retired Princeton professor and former petroleum geologist who worked for Shell Oil, and he explains the science behind M. King Hubbert's peak oil calculations, as well as what's possible and not possible where energy production is concerned, in a very clear way for the non-specialist).
The Sociopath Next Door: The Ruthless versus the Rest of Us by Martha Stout (a psychiatrist, she not only tells how to identify a sociopath--and there are more of them than you might think--but also gives a really clear explanation of what a conscience is and how it develops).
Any of Jon Krakauer's books are great--like Mulan, I thought Under the Banner of Heaven was really good, but it had many elements that reminded me of the WT. Into Thin Air is about a doomed Mt. Everest expedition, and it shows how a series of shaky decisions can lead to disaster.
Someone mentioned Guns, Germs and Steel by Jared Diamond. That's good, and so is his newest book, Collapse: How Societies Choose to Fail or Succeed.
If you're looking for some good fiction, I really liked By Way of Water by Charlotte Gulick. It's a well-written coming-of-age novel, but the mother in the story is a JW convert, so there's some very interesting stuff.
Best--and happy reading!
Jankyn