Freakonomics
Freakonomics: A Rogue Economist Explores the Hidden Side of Everything by Steven D. Levitt and Stephen J. Dubner
This is easily one of the best non-fiction books I have read in years. The topics discussed are quite interesting.
These are my favorite although I enjoyed all the sections.
1. The real reason why crime went down in 90's - legalization of abortion
2. How much of an impact do parents have on their kids - very little
3. The socioeconomic patterns of naming children
Levitt's approach and answers are fascinating. The results will leave you shaking your head in amazement at how obvious they seem.