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    FILE - A Friday, May 10, 2002 photo from files showing Alexander Litvinenko, former KGB spy and author of the book "Blowing Up Russia: Terror From Within" photographed at his home in London. Polonium first hit the headlines when it was used to kill KGB agent-turned-Kremlin critic Alexander Litvinenko in London in 2006. This week, Yasser Arafat's widow has called for the late Palestinian leader's body to be exhumed after scientists in Switzerland found elevated traces of radioactive polonium-210 on clothing he allegedly wore before his death in 2004.  (AP Photo/Alistair Fuller, File)

    Polonium first hit the headlines when it was used to kill KGB agent-turned-Kremlin critic Alexander Litvinenko in London in 2006. More »What is polonium-210 and how can it kill?

    Rolf Heuer, Director General of CERN (European Organization for Nuclear Research), answers journalist's question about the scientific seminar to deliver the latest update in the search for the Higgs boson at the European Organization for Nuclear Research (CERN) in Meyrin near Geneva, Switzerland, Wednesday, July 4, 2012. The head of the world's biggest atom smasher is claiming discovery of a new particle that he says is consistent with the long-sought Higgs boson known popularly as the "God particle."  Rolf Heuer, director of the European Center for Nuclear Research, or CERN, says "we have a discovery" of a new subatomic particle, a boson, that is "consistent with a Higgs boson."  He spoke after two independent teams at CERN said they have both "observed" a new boson that looks just like the one believed to give all matter in the universe size and shape.  (AP Photo/Keystone/Martial Trezzini)

    Scientists at the world's biggest atom smasher hailed the discovery of "the missing cornerstone … More »Eureka! Physicists celebrate evidence of particle

    This undated image made available by CERN shows a typical candidate event including two high-energy photons whose energy (depicted by red towers) is measured in the CMS electromagnetic calorimeter. The yellow lines are the measured tracks of other particles produced in the collision. The pale blue volume shows the CMS crystal calorimeter barrel. To cheers and standing ovations, scientists at the world's biggest atom smasher claimed the discovery of a new subatomic particle Wednesday July 4, 2012, calling it "consistent" with the long-sought Higgs boson — popularly known as the "God particle" — that helps explain what gives all matter in the universe size and shape.    (AP Photo/CERN)  EDITORIAL USE ONLY - MANDATORY CREDIT -

    Scientists working at the world's biggest atom smasher near Geneva have announced the … More »A closer look at the Higgs boson

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