Chapter 1: Stacks
Chapter 2: Reverse Polish Notation
Chapter 3: Australia
Chapter 4: Penal transportation
Chapter 5: Slavery
Chapter 6: Prostitution
Chapter 7: Pornography
(and I wasn't even trying)
Computer science
Internet
Pornography
Bam!
Regardless, the assumption that pornography would be in every book assumes that you don't cluster the data to topics with strong clique behavior and normalize the data to remove overly-linked (aka obvious) topics.
The full book title is: "Stack (data structure): Abstract Data Type, Data Structure, Friedrich L. Bauer, Charles Leonard Hamblin High-level Programming Language, Lisp".
Go to the Wikipedia Stack article, and just read the article's links in order: computer science, LIFO, abstract data type, data structure, Friedrich L. Bauer, Charles Leonard Hamblin, high level languages, array, linked-list, overrun, Lisp, etc. It looks like they are doing very little editing -- maybe an automated pruning algorithm.
Anyone know of other interesting uses of Wikipedia?