Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Only if it's your bag

I read this book for a class, and it is by far the dryest material I have ever read. It took me multiple attempts to stay awake through, let alone understand, each and every chapter. If this is your area of interest, then yes, Walzer has some bright insight and knows his stuff. But if you're not a pacifist/poli-sci/conflict resolution-type person, by all means don't waste your time. Professors: please think twice before throwing this at your students.