A home evergreen index and frontier evergreen indexes are maintained. The indexes cover topically-limited subject areas, which include digital information. Each index defines a hierarchy of topics. Each index further matches a topic model to the topic hierarchy's topics. Each topic model includes a pattern evaluable against the digital information, which identifies such digital information matching the topic model's topic. At least one frontier evergreen index that includes topics that are at least partially distinct from the topics included in the home evergreen index is identified. Vetted assessments for articles identified by the at least one frontier evergreen index are obtained. The articles corresponding to the vetted assessments that are favorable are selected. The patterns that include the topic models of the home evergreen index are matched against the selected articles of the digital information. The selected articles of the digital information that were matched are provided on a display.
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