Okay, I can't help myself. Basically the interaction energies that will be produced at CERN occur relatively frequently (about 1/year/100 square km I think) in the Earth's atmosphere when enormously energetic atomic nuclei hit the Earth from space. These particles are spewn out from something in space (we don't really know what yet but the current hypothesis is a hypernova - yes even bigger than a supernova, physicists are dreadful with coming up with names) and travel between galaxies and finally strike the Earth. Now given these particles have been hitting every object in the universe almost since it began, if these collisions were going to end the universe, they would have done it already. Equally, if they were going to create a world eating black hole, it would have occurred before now.

End of the physics bit. Apologies for the minor thread jack