In the overall effort to improve the quality of its search result pages, Google is continuing to make significant improvements to its search engine. Improvements include social discovery and content curation.
Starting from now on, all users worldwide can see Knowledge Graph results showing up on top of search results as a browseable list of alternative options to explore. Additionally, Google is officially going after the gathering and curation of Best Lists, Collections, and Guides on just about any topic.
From the official Google Blog: "Finally, the best answer to your question is not always a single entity, but a list or group of connected things. It’s quite challenging to pull these lists automatically from the web. But we’re now beginning to do just that. So when you search for [california lighthouses], [hurricanes in 2008] or [famous female astronomers], we’ll show you a list of these things across the top of the page. And by combining our Knowledge Graph with the collective wisdom of the web, we can even provide more subjective lists like [best action movies of the 2000s] or [things to do in paris]."
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Via Robin Good