In The Originist, by Orson Scott Card, a genius scientist is trying to figure out a very thorny problem, but cannot seem to find an answer or even know where to start. His wife advises him to go to the Galactic Library and talk to its indexers. These are people who spend their days creating links between all of the different documents in the library's collection - they read a part of one book, and when it reminds them of a concept in another book they create a link. To help out this scientist...