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Jack Dorsey\u2019s departure from the social-media giant reflects the growing primacy of engineering talent, and the waning mythology of the big-tech founder. Ukraine\u2019s military has become much better at battling Russian-backed separatists since the annexation of Crimea\u2014but now a far graver kind of war looms. And the Economist Intelligence Unit\u2019s latest list of the world\u2019s most expensive cities.

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