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GOSSAMER WINGS  Thin veins form different patterns on each dragonfly’s wings. Scientists have explained mathematically how these sections may form.

Hadza woman

SWEET SHARE  In a series of experiments, Hadza hunter-gatherers contributed honey-filled straws to a common pot based on shifting group norms, not personal preferences. Here, a Hadza woman has just finished eating honey from her straws.

kidney stone slice

JEWEL BOX Shining ultraviolet light on this thin slice of a kidney stone reveals layers of crystal growth (green and light blue) interspersed with large gemlike structures (dark blue) that show where the stone has dissolved and regrown.

African elephants

AT RISK  African elephants, like those shown here in Kenya’s Amboseli National Park, are at risk of extinction because of the ivory trade.

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