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St. Paul, Minn.

Secrets of the universe, found underground

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European Organization for Nuclear Research (CERN)
Scientists look at computer screens showing traces on the Atlas experiment of the first protons injected in the Large Hadron Collider (LHC) during its switch-on operation at the Cern's press center on Sept. 10, 2008 near Geneva. Physicists fired up the world's biggest atom-smasher in a mission to answer some of the most perplexing questions about the nature of the universe.
FABRICE COFFRINI/AFP/Getty Images
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European Organization for Nuclear Research (CERN)
Scientists look at computer screens showing traces on the Atlas experiment of the first protons injected in the Large Hadron Collider (LHC) during its switch-on operation at the Cern's press center on Sept. 10, 2008 near Geneva. Physicists fired up the world's biggest atom-smasher in a mission to answer some of the most perplexing questions about the nature of the universe.
FABRICE COFFRINI/AFP/Getty Images