Books I Recommend:

The Demon-Haunted World: Science as a Candle in the Dark by Carl Sagan
This is a great book and an easy read. All jr/high schools should have a class devoted to reading this book for a semester.
Contact by Carl Sagan
Fiction book about first contact with extra-terrestrials. Well researched and reality-based, it doesn't just sound "sciency" (dilithum crystals, photon torpedoes, etc.) it's based in real science and a real project called SETI. The movie is excellent also.
Affluenza : The All-Consuming Epidemic
What you buy vs. what you need, and why you do it.
Freakonomics : A Rogue Economist Explores the Hidden Side of Everything
This book is just generally interesting. How many teachers cheat to bring up test scores? What actually stops crime vs. what we're told. Interesting, interesting, interesting.
Dune by Frank Herbert
My favorite fiction book. So well written, I can't stoop to regular fiction anymore. I can't vouch for the sequels, but the original has no equal.
Ender's Game by Orson Scott Card
Excellent book. High-quality writing. Not quite Dune-caliber, but very good. Again, sequels not as good, but readable.