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Higgs bosons, conceptual image. Computer illustration representing multiple Higgs boson particles. The Higgs boson is an elementary particle that is thought to give other particles mass. The first observation of it was announced by scientists using the Large Hadron Collider at CERN, Switzerland, on 4th July 2012. (KEYSTONE/SCIENCE PHOTO LIBRARY/VICTOR DE SCHWANBERG/SCIENCE PHOTO LIBRARY)