To address your correct criticism, how about we modify apophenia's "15" words to:
• If two things are reliably correlated, there is causation. Either A causes B, B causes A, they have common cause, or they have a common effect you're conditioning on.
A 15-word version is possible but awkward:
• Reliable correlation implies causation: one causes the other, or there’s common cause, or common effect.
Potentially a great deal of complexity is smuggled into the word "reliable".
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Edit: A friend pointed out to me that the above sentences provide unbalanced guidance for intuitions. A more evenly balanced version is:
• Reliable correlation implies causation and unreliable correlation does not.
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.)