A device that when used has the potential to create miniature black holes. Physicist have assured us that this is of no concern, though, for
two reasons. One is that these black holes are supposed to evoporate due to Hawking Radiation, which is an unobserved theory. And the other is that if the LHC is capable of producing black holes, cosmic
rays should produce miniature black holes frequently when they collide with the atmosphere, which totally ignores the fact that these natural miniature black holes would have velocities much greater than the
Earth's escape velocity. So there is a distinct possibility that when this collider fires up in
2007, the
Earth could be doomed to be slowly accreted by miniature black holes at the center of the
earth. However, you can rest assured that the physicists that are willing to gamble with the functional existence of
Earth on the basis that this scenario will not happen do not seem to care.