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Until now, estimating how old a dinosaur was when it died has been a fairly simple process: Count up the growth rings in the fossilized bones. But new research into some of dinosaurs' living relatives, like crocodiles, suggests that this method may not always work.

NPR's Michel Martin asks Suzanne Maloney, vice president and director of the foreign policy program at the Brookings Institution, about U.S. negotiations with Iran.

Nancy Guthrie, the mother of "Today" show host Savannah Guthrie, was reported missing over the weekend. We hear from a friend of Savannah Guthrie about the impact of Nancy Guthrie's disappearance.

The Washington Post embarked on severe cuts despite appeals by the newsroom to owner Jeff Bezos. The paper is to narrow its focus largely to politics and national security.

Nancy Guthrie is 84 and has mobility issues, but she is mentally sharp, Pima County Sheriff Chris Nanos said. She was last seen Saturday evening at her home near Tucson, Ariz.

NPR's Short Wave talks about babies' perceptions of rhythm, how sleep may help us solve puzzles and why snakes may be able to fast so long.

The 2026 Olympics and Paralympics mascots are Milo and Tina, a pair of teenage, scarf-clad stoat siblings with big dreams. If you're wondering what a stoat is, you're in the right place.

On today's show singer and cellist Mia Pixley has a new album that challenges long-held beliefs about darkness. Then, West Oakland-based guitarist and singer Nia Cephas talks about her debut album. And, former "X-Factor" contestant Jason Brock is planning a jolly, good time for his upcoming holiday show.

NPR's Scott Simon speaks with roots and folk musician Langhorne Slim about his turn toward rock on the album "The Dreamin' Kind."

Doctors, patients and researchers are at the very beginning of understanding how the new class of obesity drugs interact with eating disorders.

NPR's Rob Schmitz talks to author Martha Ackmann about her new book on "American icon" Dolly Parton and the ambition it took the young Tennessean to reach success.

The city used some new methodology to conduct its biannual tally of unhoused people.