Reports out of the Far East tonight indicate North Korea may well have detonated a nuclear test, with a resultant 4.9 magnitude, or very roughly, a 20 kiloton yield, or roughly the same as the weapon dropped on Nagasaki.
Of course, tomorrow, during the State of the Union, President Obama is likely to call for further unilateral reductions in our own nuclear forces.
Keep calm and carry on. It’s not like they’ve mastered more difficult areas of technology like growing enough food to feed their population. I’d start worrying if they could do that.