High Quality Content by WIKIPEDIA articles! The safety of particle collisions at the Large Hadron Collider has been questioned in the media, on the Internet and through the courts. Particle physics experiments were ongoing as of March 2010 at the Large Hadron Collider (LHC), the world's largest and most powerful particle accelerator, built by the European Organization for Nuclear Research (CERN) near Geneva, in Switzerland. The claimed dangers of the LHC particle collisions, which began in November 2009, include doomsday scenarios involving the production of stable micro black holes and the creation of hypothetical particles called strangelets.