Making a nuclear weapon

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Experts speculate that North Korea may soon carry out a third nuclear test in hope of trying out its uranium program. Pyongyang's nuclear program was historically based on plutonium, but in 2010 the regime disclosed to visiting US scientists it was operating a uranium enrichment plant. A successful test with highly enriched uranium would alarm North Korea's adversaries as it is much easier to conceal work with uranium than with plutonium.VIDEOGRAPHIC

Making a nuclear weapon official