**FILE** A physicist explains the ATLAS experiment on a board May 20, 2011, at the European Center for Nuclear Research (CERN) outside Geneva. The illustration shows what the long-presumed Higgs boson particle is thought to look like. (Associated Press)

Photo by: Anja Niedringhaus

**FILE** A physicist explains the ATLAS experiment on a board May 20, 2011, at the European Center for Nuclear Research (CERN) outside Geneva. The illustration shows what the long-presumed Higgs boson particle is thought to look like. (Associated Press)