North Korea isn't bluffing, the nuclear threat to the US is real

On 18 March, North Korea's leader Kim Jong-un did something very odd: he gave a man a piggyback ride. It isn't every day that the dictator of an isolated, Stalinist tyranny lets one of his subjects climb on his back. North Korea had just successfully tested a new rocket engine – one that it claimed to have designed entirely by itself. The whole world will "soon witness what eventful significance the great victory won today carries," Kim was quoted as saying.