Is North Korea the 9th Nation in the World with Nuclear Weapons?

The death of North Korean leader Kim Jong-il has riveted international attention on the threat of nuclear weapons . Kim was widely reported to have been pursuing nuclear warheads and ballistic missiles to deliver them, and he presided over a pair of nuclear bomb blast tests (confirmed by seismograph). No one outside North Korea knows whether the secretive, totalitarian nation possesses an actual warhead.

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Is North Korea the 9th Nation in the World with Nuclear Weapons?