need non-fiction now

I'm picking the book for our book club next month, and I need suggestions!

When I got home from our meeting tonight and I immediately went to our bookshelves and pulled approximately half the books off as possible selections. Life of Pi by Yann Martel - always a classic book group read. The White Tiger by Aravind Adiga - a dark and fictional look into India's economy. Caramelo by Sandra Cisneros - Chicana lit full of beautiful and brutal prose. In the Time of the Butterflies by Julia Alvarez - inspiring and tragic (need I say also Latina).

Luckily, I decided I'd chose something from the "topical non-fiction" genre. I think I made that term up, and define it as non-fiction that is based around a topic of interest rather than biography or general history (e.g. math, physics, medicine). I don't read as much there, so my choices are more limited. A good thing. I have a few ideas, but would love more suggestions.

The Drunkard's Walk: How Randomness Rules Our Lives by Leonard Mlodinow. Pros: An accessible book about math, which I find different and interesting. Some of the puzzles he presents would be fun to talk through together. Cons: While the book was fascinating, it was a little slow in parts. The math topic may turn some people off.

Outliers or What the Dog Saw by Malcolm Gladwell. Pros: Very engaging writing, easy to get through. May be able to pair "Outliers" with a chapter of "The Drunkard's Walk" for an interesting contrast/comparison for people. Cons: I haven't actually read either of these. But maybe that's a pro because I love to read new things.

The Immortal Life of Henrietta Lacks by Rebecca Skloot. Pros: brings up really interesting history of both culture and medicine. Cons: drags a little, not sure how much discussion it will lead to.

In Defense of Food by Michael Pollan. Pros: quick read on a relevant topic for everyone. Cons: a little preachy. Bonus: I could play this awesome clip from NPR's "Wait Wait Don't Tell Me", from 2:45-6:45 in particular. (It's really worth clicking on the link, I promise.)

The Killer Angels by Michael Shaara. Pros: Really engaging historical fiction. Cons: Not "topical" and not "non-fiction". How did this one get on the list?

What book should we read? And please, suggest more.