Takeaway: More unconventional ways of looking at the world around us.
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I like economics. Overall I like this book and the movement of micro-economics and behavioral economics books that was created out of the original Freakenomics (although I think some people need to think of some better titles.)
The method of Freakenomics is to find an issue, then think of a way to look at that issue using mathematical models. The Freakenomics guys and their counterpart research economics that do a lot of the research are creative. They have to be creative, and willing to balk conventional wisdom, to come up with their research ideas. (And hope the mathematical models really explain the reality.)