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If you've taken part in a religious service, have you ever stopped to think about how it all came to be? How did people become believers? Where did the rituals come from? And what purpose does it all serve? This week, we bring you a July 2018 episode with social psychologist Azim Shariff. He argues that we should consider religion from a Darwinian perspective, as an innovation that helped human societies to thrive and flourish.

Food and Drug Administration advisers found that celecoxib poses no greater risk for heart attacks and strokes than prescription doses of popular pain relievers ibuprofen and naproxen do.

"We've never been in the data business," Cook tells NPR. He was responding to a report that Facebook struck deals giving Apple and other device makers access to Facebook users' personal information.

Artificial intelligence is an electricity hog. Google says its total greenhouse gas emissions climbed nearly 50% over five years, mostly due to electricity that powers AI data centers.

Lawmakers are set to tackle a Senate impeachment trial of Homeland Security Secretary Alejandro Mayorkas, and ongoing debate over aid to Israel, Ukraine and other allies.

Since the 1980s, a flock of Vaux's Swifts has been roosting in a Portland chimney during the month of September, on their way to their winter home in Central and South America. Thousands of Portlanders show up to watch them.

NPR's Brian Mann and North Country Public Radio's David Sommerstein head into the high country for a spring picnic surrounded by sun -- and snow.

Hurricane Fiona has left Puerto Rico crippled by flooding and power failures. How are people there coping and how much better is the island's response compared to years past?

Hold out your hand for a century, and 100 million particles of dark matter will pass through each second without leaving a trace. Still, a physicist in South Dakota thinks he may be able to catch one.

Day after day, there is less food on the shelves, less power to turn on lights or run businesses and more anger over the difficulties. But opposition efforts to recall the president are being stymied.