What kind of math does North Korea really know anything about? Do they even know what word Axiom means and how it is applied? America has more to worry about than The Missle East! What if North Korea explodes underground again even something bigger than the last one. Why don't Russia and China don't step in? Maybe the mathematicians in their nations have figured out where to best do the testing and adviced them the best place so that maxium reaction of the epicentre travels outward towards The Pacific Ocean! Both Russia and China have reasons to see that this could be possible because South Korea and Japan are thorns in theirs sides.