May someone who does not understand any of this ask a question?
Years ago scientists made small black holes here in Earth, and, while I was screaming in protest, they assured me they would not fall to the center of the Earth and slowly eat us all. They assured us those black holes would evaporate.
Scientists have not made black holes here on earth. The energy required to do this is insanely higher than anything we are currently capable of. Even at the LHC we aren’t even hitting the energy levels of cosmic rays hitting out own atmosphere. These aren’t the most reputable sources, but you’ll get the basic idea…
In addition to what the other reply points out (that the LHC and such are not sufficient to produce a black hole),
another calculation I've seen shows that, even if it had produced a black hole with mass given by the energy of these collisions, and even if these black holes had started at rest with respect to the earth, and like, fallen into the earth (and started oscillating around the center), and if they did not evaporate (say, if Hawking radiation wasn't actually a thing), then the amount of time needed for them to swallow any appreciable amount of matter at all, would be very very long, and so would not actually cause any problem for the forseeable future.
(not that any were created. The detectors would have noticed. But even if they had been created, it wouldn't have been a problem, even if we are wrong in thinking that they would immediately evaporate.)
The thing is, if the black hole is made from something of a given mass, then, well, it only has the amount of gravitational attraction associated with that quantity of mass. And, that is a very small amount unless the-thing-to-be-attracted is very very very very close to it, and, a point particle falling through the earth wouldn't be likely to get that close to many atoms.
There was controversy about the LHC possibly creating small black holes with disastrous consequences. However
* The LHC probably doesn't have the energy density to do that,
* If it did, such a tiny black hole would be so small, and presumably so hot, that it would have a hard time actually taking in any matter as it careens through the earth,
* There are cosmic ray collisions in the upper atmosphere that are far more energetic than anything the LHC can do, so if there were some disaster waiting here, it would already have happened long long ago.
(You might also have run across headlines breathlessly talking about laboratory black holes in metamaterials or whatever — those are not black holes in the gravitational sense, but are metaphorically similar because of the way they can trap light/sound/whatever.)
Years ago scientists made small black holes here in Earth, and, while I was screaming in protest, they assured me they would not fall to the center of the Earth and slowly eat us all. They assured us those black holes would evaporate.
Has anything changed? Should I be worried?