The latest “variant of concern” has spread far—and fast. We examine what has been learned about it at equally striking speed, and ask what to look out for next. South-East Asia has long had a methamphetamine problem; so-called compulsory treatment centres are only making matters worse. And the effort to make a minuscule lemur science’s next super-model. For full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/intelligenceoffer
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