The country’s increasingly unpopular president, Yoon Suk Yeol, backed down six hours after his shocking move of imposing martial law. South Korea’s democracy has held firm—so far. Brazil’s gangsters have found a neat way to launder assets through the legal economy: by getting involved with politics (7:26). And the hefty computations going into the design of breeze-free badminton arenas (15:17).
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