Rising Life Expectancy and the Dementia Challenge

The Chinese leader who took over a squabbling party following the Tiananmen Square massacre surprised the world by stifling dissent, overseeing a staggering economic awakening—and occasionally breaking into song. We examine the lessons to be drawn from his legacy. After scores of failures, a new Alzheimer’s treatment shows real promise. And our annual ranking of the world’s most expensive cities.

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