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Dolphins, like humans, are part of complex social networks. And research now indicates that they use their unique whistle sounds to identify and communicate with each other. "Every time a dolphin heard its signature whistle, it called back, sometimes multiple times," one researcher says.

A billion people worldwide live in slums, largely invisible to city services and governments — but not to satellites. A global movement is putting mapping technology in the hands of slum dwellers to persuade governments and the residents themselves to see these shadow cities in a whole new light. NPR's Gregory Warner visits one slum in the Kenyan capital, Nairobi.

National Hurricane Center data for New York City shows development happening in at-risk areas, even as climate change brings more frequent and intense storms.

The gatherings are an echo of the protests that have erupted in Iran since the death of 22-year-old Mahsa Amini, who had been detained by the country's so-called morality police.

The historically Black Penumbra Theatre has received millions in grants to remake itself into a center for racial healing. What will its choices reveal about regional theater's future?

The conspiracy theory claims global elites plot to hoard the world's wealth and resources, leaving the rest of the planet to starve — and it's gaining traction in Moscow amid the Ukraine war.

Republican Ohio lawmakers are considering a bill that would create a special August 2023 election to put a constitutional change before voters in advance of November election.

Who will negotiate with the warring generals, as most of the international community flees Sudan?

Conservationists say a sustainable fishing program has helped the recovery of the local pirarucu — which can be up to 10-feet long and weigh 450 pounds.

People are protesting a court ruling to sentence Istanbul Mayor Ekrem Imamoglu to prison and bar him from politics for two-plus years. He's seen as a key challenger to President Recep Tayyip Erdogan.