I think this is a shitty click bait title. Why not include the feature which is replaced in the title?

But I guess thread creators hate this one simple trick.

Black holes and the uncertainty of what lies behind the event horizon. The possibility that inside a black hole, a whole new universe could exist without us ever knowing. When tripping through life taught me one thing, it is that many things can be seen as part of a huge fractal, and that view fits right into the interpretation that black holes are nothing else than universes in universes. After all, our big bang might just be another ordinary blacklist hole, reaching critical mass.

Of course I can not prove it, but I love thinking about it.