How to Tell If North Korea Is About to Test a Nuclear Bomb at Punggye-ri
People watch a television screen showing a news broadcast on North Korea’s ballistic missile launch at Seoul Station in Seoul, South Korea. (Photographer: SeongJoon Cho/Bloomberg)

How to Tell If North Korea Is About to Test a Nuclear Bomb at Punggye-ri

(Bloomberg) -- When North Korea unleashed an earth-shaking nuclear bomb of as much as 250 kilotons on Sept. 3, one man wasn’t fazed.
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