It's a little too late since you've already chosen one.
Unscientific America. The perfect nerdfighter book! It's about how most of the US is completely unaware of the science around them. They are unable to make informed decisions when it comes to things like global warming, health concerns or nuclear energy. Living in Canada, I think it should be titled 'Unscientific North America' due to the fact that Canada is 'dumbing down' too.
Two nonfiction I've recently enjoyed - In Defense of Food by Michael Pollan, but if you haven't yet read The Omnivore's Dilemma first and Born to Run Christopher McDougall - lots of story, reads like a novel. Enjoy!
what about ..... Percy Jackson and the Olympians.. its got 5 books to it,the 1st is called the Lightning Thief. its got greek mythology with action, and adventure :) they are a bit juvenille but i think you'd enjoy them otherwise :)