A worker stands by the CERN's Compact Muon Solenoid (CMS), a general-purpose detector at the Large Hadron Collider (LHC), during maintenance works on July 19, 2013 in Meyrin, near Geneva. Tests at the world's biggest collider have provided the most exhaustive confirmation to date of the Standard Model, a four-decade-old conceptual framework for fundamental particles, CERN said. AFP PHOTO / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)
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