8. A memory device that stores computer-executable instructions, the memory device comprising: instructions for obtaining one or more textual sequences from a document of a sequence of documents; instructions for identifying one or more pairs of the one or more textual sequences that occur within a paragraph of one another in the document; instructions for identifying, based on the one or more textual sequences and the one or more pairs, a presence of novel content in the document where the novel content includes content that does not occur in other documents in the sequence of documents; and instructions for assigning a score to the document based on the identified novel content of the document.
8. A memory device that stores computer-executable instructions, the memory device comprising: instructions for obtaining one or more textual sequences from a document of a sequence of documents; instructions for identifying one or more pairs of the one or more textual sequences that occur within a paragraph of one another in the document; instructions for identifying, based on the one or more textual sequences and the one or more pairs, a presence of novel content in the document where the novel content includes content that does not occur in other documents in the sequence of documents; and instructions for assigning a score to the document based on the identified novel content of the document. 9. The memory device of claim 8 , where the sequence of documents includes a temporally-ordered cluster of news documents.