Found in 1 comment on Hacker News
saraid216 · 2012-10-12 · Original thread
Seeing one Topic-X post will trigger many people to think, "Oh, and I remember Y-related-to-Topic-X," as well as "Hey, I wonder if I could find out more about Y-related-to-Topic-X," and away you go.

Also, (even though it is not a great book; it is mediocre IMO).

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