First, you should know that in principle, making a black hole is easy. Basically, the only thing you need to do is to slam two tiny, subatomic particles together in a particle accelerator.
According to some calculations, this super particle accelerator could summon up one black hole every second! There they are: black hole, black hole, black hole; Pop! Pop! Pop! Now suppose that against all expectations, these baby black holes aren’t the fleeting, unstable mini monsters we expect them to be. Suppose they’re stable.

At first, no one would notice. They wouldn’t eat up the lab or something. Instead, they would escape. One by one, the baby black holes would leak away from the lab, going through concrete walls as if they didn’t exist. If you’re that small, traveling through solid objects is no problem: you just rarely bump into a molecule.

And then? Slowly, our refugee black holes would begin to sink towards the center of the Earth, attracted by gravity. And there, they would sit and