It's been over a year since Google started testing topic bubbles in the then-called-Feed, and many months since that design rolled out as part of the rebranded Discover. In the time since, we haven't noticed any major changes in the interface and we had almost started believing that server-side tests may have stopped on the app. But no, they've been resurrected (perhaps they never even died?) and are back now thanks to a new Discover that sheds off its signature topic bubbles.

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