I've looked through a few annotated versions of classic books, and it's shocking how much of what's in there is basically pop-culture references totally lost on us now.

"Inside Joke", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

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I've looked through a few annotated versions of classic books, and it's shocking how much of what's in there is basically pop-culture references totally lost on us now.