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We remember Ai, a highly intelligent chimpanzee who lived at the Primate Research Institute of Kyoto University for most of her life, except the time she escaped and walked around campus.

A trial was about to launch for a vaccine that would ward off the HIV virus. It would be an incredible breakthrough. Then it looked as if it would be over before it started.

The Administration for a Healthy America is RFK Jr.'s plan to tackle chronic disease, addiction and other persistent problems. But so far it's not being set up like previous new agencies.

Minneapolis is at the center of sweeping, evolving federal immigration push. It demonstrates how different immigration enforcement is under Trump's second administration - and raises questions about the lingering effects on local communities and law enforcement.

Can't seem to match the energy of a good friend? You might be on opposite ends of the personality spectrum — and that's OK. Here's how to foster deep connections despite your differences.

A small Mexican Navy plane transporting a young medical patient and seven others crashed Monday near Galveston, killing at least five people and setting off a search in waters along the Texas coast.

For the first time on record, renewable energy generated more electricity for the planet than coal, a new report says.

The annual contest for students in grades four through 12 is back for its eighth year — this time with a special prize for a podcast that marks the 250th anniversary of the United States.

Reporters from the NPR Network are covering the uncertainty and lapse in benefits in states across the country.

Four people were killed and 10 wounded in a shooting during a family gathering at a banquet hall in Stockton, sheriff's officials said Saturday.