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After two years of upgrades and repairs, proton beams are once again circulating around the Large Hadron Collider, located at the CERN laboratory near Geneva, Switzerland. With the collider back in action, the more than 1,700 U.S. scientists who work on LHC experiments are prepared to join thousands of their international colleagues to study the highest-energy particle collisions ever achieved in the laboratory.
These collisions--hundreds of millions of them every second--will lead scientists to new and unexplored realms of physics and could yield extraordinary insights into the nature of the physical universe.Image credit: CERN
