For me, the hook was a hardened economics academic and author admitting the value of public libraries and stating it well. The rabbit hole of the day was not being able to put aside the rest of the book, When to Rob a Bank: And 131 More Warped Suggestions and Well Intended Rants  available in print, audio book, and as a downloadable  eBook. Freakonomics authors Levitt and Dubner have published their blog full of bite-sized  observations and wit.