thanks, this is exactly the case. a better objection is, it's not strictly true because things can be some complex net of the above cases, and it doesn't always break down into one of the four, but that doesn't fit in "15" words, and it's less important
edit: also it's possible in rare cases for things to be uncorrelated but causally connected
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.)