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CERN's scientists speak during a press conference on LHC (large hadron collider) restart at CERN (the European particle physics laboratory) in Meyrin, near Geneva, Switzerland, on Monday, November 23, 2009. Scientists turned on the Large Hadron Collider on Friday night, November 20, 2009, for the first time since the machine suffered a failure more than a year ago and had to be shut down shortly after the start. (KEYSTONE/Laurent Gillieron)