In one example, a computing system includes at least one processor, a communication unit, and a predictive knowledge system. The predictive knowledge system is operable by the at least one processor to determine, based at least in part on the current location of the computing device, a particular geographic region from a plurality of defined geographic regions, the particular geographic region including the current location of the computing device, determine, based on an aggregated web access history for a plurality of computing devices, a content source associated with the particular geographic region, receive, from the content source, content designated for use by the predictive knowledge system, and send, via the communication unit and to the computing device, at least a portion of the content.
Please help me write a proper abstract based on the patent claims. CLAIM: 1. A method comprising: receiving, by a predictive knowledge system executing on a computing system, an indication of a current location of a computing device; determining, by the predictive knowledge system, based at least in part on the current location of the computing device, a particular geographic region from a plurality of defined geographic regions, the particular geographic region including the current location of the computing device; determining, by the predictive knowledge system, based on an aggregated web access history for a plurality of computing devices, a content source associated with the particular geographic region; receiving, by the predictive knowledge system, from the content source, content designated for use by the predictive knowledge system; and sending, by the predictive knowledge system, to the computing device, at least a portion of the content designated for use by the predictive knowledge system. 2. The method of claim 1, further comprising: receiving, from the content source, at least one structural definition for the content designated for use by the predictive knowledge system, the at least one structural definition indicating a manner in which the content designated for use by the predictive knowledge system is to be displayed at the computing device, wherein sending the at least a portion of the content comprises sending, to the computing device, the portion of the content for display in accordance with the at least one structural definition. 3. The method of claim 2, wherein the at least one structural definition comprises at least one of: an indication of a font in which a text portion of the content designated for use by the predictive knowledge system is to be displayed by the computing device; an indication of a font style in which the text portion of the content designated for use by the predictive knowledge system is to be displayed by the computing device; or an indication of how a background image of the content designated for use by the predictive knowledge system is to be displayed by the computing device. 4. The method of claim 1, wherein receiving the content designated for use by the predictive knowledge system comprises receiving a webpage that includes the content designated for use by the predictive knowledge system in a header area of the webpage. 5. The method of claim 1, further comprising: determining a level of recentness for the content, wherein sending at least a portion of the content comprises sending at least a portion of the content in response to determining that the level of recentness satisfies a threshold. 6. The method of claim 5, further comprising: storing, by the predictive knowledge system, a version of the content, wherein determining the level of recentness for the content comprises determining the level of recentness based on at least one of: a time at which the version of the content was stored, a current time, the version of the content, or the content. 7. The method of claim 1, wherein the aggregated web access history comprises respective indications of one or more content sources previously accessed by the plurality of computing devices and respective geographic locations from which the one or more content sources were accessed, the method further comprising: determining, by the predictive knowledge system and based at least in part on the aggregated web access history, the plurality of defined geographic regions. 8. The method of claim 1, wherein determining the content source associated with the particular geographic region comprises: determining, by the predictive knowledge system and for the particular geographic region, a plurality of content sources associated with the particular geographic region, wherein a respective popularity measure is associated with each content source from the plurality of content sources; and determining, by the predictive knowledge system and based at least in part on the respective popularity measures, the content source associated with the particular geographic region. 9. The method of claim 8, further comprising: receiving, by the predictive knowledge system, from the computing device, an indication of at least one of: a selection of a user-interface element that includes the content, or a dismissal of the user-interface element; and responsive to receiving the indication, modifying, by the predictive knowledge system and based on the indication, the respective popularity measure associated with the content source associated with the particular geographic region. 10. The method of claim 1, wherein determining the particular geographic region comprises: determining, by the predictive knowledge system, a subset of geographic regions from the plurality of defined geographic regions, each geographic region from the subset of geographic regions including the current location; and selecting, as the particular geographic region, a smallest geographic region from the subset of geographic regions. 11. The method of claim 1, wherein receiving the content designated for use by the predictive knowledge system comprises receiving a plurality of content portions and indications of corresponding geographic locations for which each of the plurality of content portions are designated for use, the method further comprising: determining, based at least in part on the particular geographic region and the corresponding geographic locations for which each of the plurality of content portions are designated for use and, a particular content portion from the plurality of content portions, wherein sending at least a portion of the content comprises sending the particular content portion. 12. The method of claim 1, wherein sending at least a portion of the content comprises sending at least a portion of the content without first receiving, from the computing device, a request that specifies the content. 13. A computing system, comprising: at least one processor; a communication unit configured to receive, from a computing device, an indication of a current location of the computing device; and a predictive knowledge system operable by the at least one processor to: determine, based at least in part on the current location of the computing device, a particular geographic region from a plurality of defined geographic regions, the particular geographic region including the current location of the computing device; determine, based on an aggregated web access history for a plurality of computing devices, a content source associated with the particular geographic region; receive, from the content source, content designated for use by the predictive knowledge system; and send, via the communication unit and to the computing device, at least a portion of the content. 14. The computing system of claim 13, wherein the predictive knowledge system is operable by the at least one processor to: receive, via the communication unit and from the content source, at least one structural definition for the content designated for use by the predictive knowledge system, the at least one structural definition indicating a manner in which the content designated for use by the predictive knowledge system is to be displayed at the computing device; and send, via the communication unit and to the computing device, the portion of the content for display in accordance with the at least one structural definition, wherein the at least one structural definition comprises at least one of: an indication of a font in which a text portion of the content designated for use by the predictive knowledge system is to be displayed by the computing device; an indication of a font style in which the text portion of the content designated for use by the predictive knowledge system is to be displayed by the computing device; or an indication of how a background image of the content designated for use by the predictive knowledge system is to be displayed by the computing device. 15. The computing system of claim 13, further comprising: a computer-readable storage medium configured to cache a version of the content, wherein the predictive knowledge system is operable by the at least one processor to: determine a level of recentness for the content based on at least one of: a time at which the version of the content was stored, a current time, the version of the content, or the content; and send, via the communication unit, at least a portion of the content in response to determining that the level of recentness satisfies a threshold. 16. The computing system of claim 13, wherein the aggregated web access history comprises respective indications of one or more content sources previously accessed by the plurality of computing devices and respective geographic locations from which the one or more content sources were accessed, and wherein the predictive knowledge system is operable by the at least one processor to determine, based at least in part on the aggregated web access history, the plurality of defined geographic regions. 17. The computing system of claim 13, wherein the predictive knowledge system is operable by the at least one processor to: determine, for the particular geographic region, a plurality of content sources associated with the particular geographic region, wherein a respective popularity measure is associated with each content source from the plurality of content sources; and determine, based at least in part on the respective popularity measures, the content source associated with the particular geographic region. 18. The computing system of claim 17, wherein the predictive knowledge system is operable by the at least one processor to: receive, via the communication unit and from the computing device, an indication of at least one of: a selection of a user-interface element that includes the content, or a dismissal of the user-interface element; and responsive to receiving the indication, modify, based on the indication, the respective popularity measure associated with the content source associated with the particular geographic region. 19. The computing system of claim 13, wherein the predictive knowledge system is operable by the at least one processor to: receive, via the communication unit, a plurality of content portions and indications of corresponding geographic locations for which each of the plurality of content portions are designated for use; determine, based at least in part on the particular geographic region and the corresponding geographic locations for which each of the plurality of content portions are designated for use and, a particular content portion from the plurality of content portions; and send, via the communication unit and to the computing device, the particular content portion. 20. A computer-readable storage medium encoded with instructions that, when executed, cause one or more processors of a computing system to: receive an indication of a current location of a computing device; determine, based at least in part on the current location of the computing device, a particular geographic region from a plurality of defined geographic regions, the particular geographic region including the current location of the computing device; determine, based on an aggregated web access history for a plurality of computing devices, a content source associated with the particular geographic region; receive, from the content source, content designated for use by a predictive knowledge system; and send, to the computing device, at least a portion of the content.