20. The device of claim 19 wherein the rule selector is further configured for selecting a set of extraction rules based on the content type.
19. An electronic device comprising: an indexer configured to, while content is being displayed on the electronic device, periodically update a first word buffer with words extracted from closed captioning information corresponding to content since a beginning of a program or story; a monitor configured for monitoring user interaction with the electronic device to identify when a user provides user input indicating an interest in learning more information about content currently being displayed on the electronic device; a genre extractor configured to determine a genre of the content; a rule selector configured for selecting a set of extraction rules for information extraction, based on the genre of the content, wherein the set of extraction rules differs from another set of extraction rules corresponding to a different genre; and an information extractor configured for extracting key information from the first word buffer based on the selected extraction rules.