Jack Dorsey’s departure from the social-media giant reflects the growing primacy of engineering talent, and the waning mythology of the big-tech founder. Ukraine’s military has become much better at battling Russian-backed separatists since the annexation of Crimea—but now a far graver kind of war looms. And the Economist Intelligence Unit’s latest list of the world’s most expensive cities.Have your say about “The Intelligence” in our survey here www.economist.com/intelligencesurvey. And for full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/intelligenceoffer
 See acast.com/privacy for privacy and opt-out information.