European Organization for Nuclear Research (CERN) scientists are seen at the CERN’s control center, during the switch on operation of the Large Hadron Collider (LHC), the world’s largest particle collider, in Geneva, Switzerland, Wednesday, Sept. 10, 2008. The world’s largest particle collider successfully completed its first major test by firing a beam of protons all the way around a 17-mile (27-kilometer) tunnel Wednesday in what scientists hope is the next great step to understanding the makeup of the universe. (AP Photo/Fabrice Coffrini, Pool)
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