North Korea claims, unverifiably, that their most recent test involved a miniaturised device: http://www.npr.org/2013/02/12/171818226/did-north-korea-test-a-mi

North Korea claims, unverifiably, that their most recent test involved a miniaturised device: http://www.npr.org/2013/02/12/171818226/did-north-korea-test-a-miniature-nuclear-bomb http://www.npr.org/2013/02/12/171818226/did-north-korea-test...