2,300-year-old Chinese chemistry formula deciphered after analyzing ancient coins

Knife coins used in ancient China that were analyzed in the study. (The Trustees of the British Museum/CC BY-NC-SA 4.0) Knife coins used in ancient China that were analyzed in the study. (The Trustees of the British Museum/CC BY-NC-SA 4.0)

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North Korea fires missile over Japan

North Korea on Tuesday fired an intermediate-range ballistic missile over Japan for the first time in five years, forcing Japan to issue evacuation notices and suspend trains, as the North escalates tests of weapons designed to strike regional U.S. allies.

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