If after ten minutes you don't know who the sucker is, it's you.
(Common advice which applies mainly to zero-sum competitive situations. I heard it in the context of negotiating with competitors, but I imagine it applies to poker, political strategy, and other things too.)
People want to tell everything instead of telling the best 15 words. They want to learn everything instead of the best 15 words. In this thread, instead post the best 15-words from a book you've read recently (or anything else). It has to stand on its own. It's not a summary, the whole value needs to be contained in those words.
I'll start in the comments below.
(Voted by the Schelling study group as the best exercise of the meeting.)