In this May 20, 2011 file photo, a wall painting by artist Josef Kristofoletti is seen at the Atlas experiment site at the European Center for Nuclear Research, CERN, outside Geneva, Switzerland. The painting shows how a Higgs boson may look. Scientists at CERN plan to make an announcement on Wednesday, July 4, 2012 about their hunt for the elusive sub-atomic particle. Physicists have said previously they are increasingly confident that they are closing in on it based on hints at its existence hidden away in reams of data. (AP Photo/Anja Niedringhaus)
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