Did North Korea Detonate a Hydrogen Bomb? Here’s What We Know – NY Times 6 JAN 16
http://www.nytimes.com/2016/01/07/world/asia/north-korea-hydrogen-bomb-q-a.html?smprod=nytcore-iphone&smid=nytcore-iphone-share A closer read of North Korea’s announcement on Wednesday, 6 JAN, whether it can be verified and its previous detonations.