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Google seems to be testing or rolling out a new feature in the people also ask section named "learn more about." It shows a box that basically teaches you more about the topic you searched for.
Valentin Pletzer spotted this and posted on Twitter saying "Google tests a new kind of carousel at the end of "people also ask". It's called "learn more about" and it seems to feature lists."
Here is his screen shot:
I cannot replicate it.
Forum discussion at Twitter.
