"At Home: A short history of Private Life" by Bill Bryson. Bryson does a good job at condensing complicated subjects down to more understandable levels. I also read "A Short History of Nearly Everything" which not only looks at the history of Earth, but also at the study of that history.
Also, "The Count of Monte Cristo." I just got the Amazon Kindle app, there are a ton of free books, mostly classics. It is quite possibly the greatest thing ever.