FOR ALL THE BRAGGING IT has done about its nuclear program, North Korea has never, to anyone's knowledge, tested a nuclear bomb. That's why the world grew alarmed when satellite photos showed what looked like an explosion and a mushroom-shaped cloud over a remote area in the northern part of the country. Pyongyang denied it had exploded a nuke and even escorted a group of foreign ambassadors to the area, where they saw thousands of workers toiling mostly by hand to build a dam. A local official said the blasts were part of an effort to speed up the project. An...
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