1. A method comprising: identifying, at a first time, data at a memory location in response to topic-specific searches; duplicating the data to a new memory location, wherein the memory location and the new memory location comprise an expanded search space; responding, at a second time which is later than the first time, to a first topic-specific search using the data in the new memory location; identifying a reduction event related to the topic-specific searches; collapsing, after the reduction event, the expanded search space to yield a reduced search space; and responding to a second topic-specific search using data in the reduced search space.