The Large Hadron Collider's ATLAS detector under construction in 2005. ATLAS is one of the tools physicists are using to try and understand how the universe works. Maximilien Brice/CERN hide caption

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High-energy physics in action: an image of an event in CERN's CMS detector during the search for the Higgs boson. CERN hide caption

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The Universe of Particles exhibition at CERN in 2011. Fabrice Coffrini/AFP/Getty Images hide caption

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