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Studies have long shown that Western parents speak a singsongy high-pitched language to babies. Now researchers have gone to the Amazon, to the Hadza people and more to see if it's a global thing.

Donald Trump ripped from a well-worn page in his playbook Tuesday night — lashing out with a speech that was at times full of lies and conspiracies. And that's really no surprise.

Crowded skies, known to pilots as mutual traffic, are a large part of air travel's woes. Mike Sammartino, director of system operations for the Federal Aviation Administration, attributes overcrowding to airlines' overloaded schedules. He speaks with Renee Montagne

In recent years, many big cities have suffered epidemics of fatal heat stroke, and scientists predict more-frequent heat waves. But global warming isn't the only factor. Big cities also create their own heat.

NPR's Scott Simon asks "Jeopardy!" champion Amy Schneider about her new memoir, "In the Form of a Question."

Hospitals are preparing for how to handle mass shootings in case the next one is in their backyard. One difficult call is whether to lockdown the facility, which can have emotional consequences.

Ahmed Alnaouq posts the stories of Palestinians with the organization We Are Not Numbers. Then, he lost over 20 members of his family when an Israeli airstrike hit his family home.

The Oscar-winning actor experienced her first panic attack at age 7. But Stone says acting helps with her anxiety, because it draws on her "big feelings" and forces her to live in the moment.

Basketball is gaining popularity in Rwanda. We chat with a few players and fans to learn why.

A volunteer curator in Philadelphia puts on art exhibits to raise awareness of lives lost to gun violence.