Those are not the best 15 words!
Although this is the lesser of two evils. This comment and this are, it seems to me, trying too hard to be the smartest person in the room: technically correct, but only if you ride roughshod over Gricean principles. This is a common failure mode.
(My comment was kind-of tongue-in-cheek. I know what you actually meant.)
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.)