There was controversy about the LHC possibly creating small black holes with disastrous consequences. However * The LHC probably doesn't have the energy densit

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.)