They still do not know for sure, but scientists at the Large Hadron Collider at Cern believe they are tantalisingly close to discovering whether the Higgs boson particle exists.
Whether the particle is found to exist or not, confirmation one way or another opens the door to many more questions about the fundamental nature of the universe.
Director general of Cern Rolf-Dieter Heuer and Geoff Forshaw, co-author of The Quantum Universe: Everything that Can Happen Does Happen, discuss where scientists should be looking for the next physics breakthrough.
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