North Korean leader Kim Jong Un visits the Phyongchon Revolutionary Site, in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang December 10, 2015. REUTERS/KCNA
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North Korean leader Kim Jong Un appeared on Thursday to claim his country has developed a hydrogen bomb, a step up from the less powerful atomic bomb, but outside experts were skeptical.A hydrogen bomb, also known as a thermonuclear bomb, uses more advanced technology to produce a significantly more powerful blast than an atomic bomb.If the hydrogen bomb claim is true, it would indicate advances in the North's pursuit of nuclear weapons.North Korea claimed in 2010 that it had successfully developed fusion technology.
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