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Masai warriors

NOT TOO VIOLENT  Small-scale human societies, represented here by African Masai warriors, are neither more nor less violent than state societies, a new study concludes. As often happens in investigations of warfare, the report has sparked controversy.

New Delhi

SILENT KILLER  Pollution, especially dirty air such as seen here in New Delhi, is linked to roughly one-sixth of the world’s premature deaths, a new study finds.

Go stones on a Go board

GAME CHANGER  The first completely self-taught AlphaGo program tops all of its machine-learning predecessors, no contest.

illustration of mammoths

BRINGING ‘EM BACK ALIVE  Scientists think they have the tools to transform elephants into woolly mammoths (illustrated) and reverse extinction. A new book explores the promise and pitfalls of de-extinction.



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