With the ouster of Travis Kalanick, its founder and chief executive, Uber has vowed to mend an array of broken and frayed relationships. It can start with cities. It can focus on the sharing of some basic information. Its competitors, including Lyft, can join in this project, too. App-based ride services have changed the urban world, often for the good. …

By 2050, more than one-quarter of the world’s population will live in Africa — up from about one-sixth today. Even if these projections are slightly off, that fact should serve as a call to action for a continent whose long-term promise is equaled by wide-ranging perils. The numbers come from the latest United Nations report on population trends, which projects …

When North Korea tested an intercontinental ballistic missile this week — what its boy tyrant called a ‘gift to the American bastards’ — the response from the Trump administration was fairly conventional. Secretary of State Rex Tillerson correctly called it an escalation. He announced America’s intention to bring the matter before the UN Security Council. And he assured, “We will …