Google News enhanced the presentation for the clusters of related articles: after showing options to filter the articles, a search option and feeds, Google News added a graph that shows the number of sources covering the story. There's also a timeline that lets you understand how the story developed.
"Our grouping technology takes into account many factors, such as titles, text, and publication time. We then use various clustering algorithms to identify stories we think are closely related," explains the help center.
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