Marshall Rogers-Martinez

Pedestrians in Tokyo pass a television screen broadcasting a report on May 4, 2019 that North Korea has fired several unidentified short-range projectiles into the sea off its eastern coast. AP Photo/Koji Sasahara

What geology reveals about North Korea’s nuclear weapons – and what it obscures

North Korea is a major military threat to the US and its Asian allies, but exactly how powerful are its nuclear weapons? An earth scientist explains why it’s hard to answer this question.

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