explaining that simply changing formulas to display more new pages results in lower-quality searches much of the time. He then unveiled his team's solution: a mathematical model that tries to determine when users want new information and when they don't. (And yes, like all Google initiatives, it had a name: QDF, for "query deserves freshness.")
The QDF solution revolves around determining whether a topic is "hot." If news sites or blog posts are actively writing about a topic, the model figures that it is one for which users are more likely to want current information.
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