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Freiburg-based physicist Karl Jakobs explains aspects of the Atlas particle experiment currently being conducted by the European Organization for Nuclear Research (Cern) in Geneva, Switzerland, 2 May 2017. The Atlas particle detector is part of the Large Hadron Collider (LHC) situated some 100 metres below the earth. European researchers are on the hunt for dark matter - a hypothesized and as yet undiscovered form of matter. Photo: Christiane Oelrich/dpa /MediaPunch ***FOR USA ONLY***