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Research on young mice and rats shows how nicotine hijacks brain systems involved in learning, memory, impulse control and addiction.

Kurdish forces in northern Syria relied on American troops to help them maintain control of the region. Now, they are aligning themselves with Syrian forces that are backed by Russia.

Two blazes, in Los Angeles County, and in Riverside County, destroyed more than 100 structures this week. Evacuation orders had been lifted in all of Los Angeles County by Saturday night.

The U.S. Food and Drug Administration treats most data it gets on the development of new drugs and medical devices as confidential to companies. Critics say making the data public would help patients.

Bloomberg Businessweekcolumnist Joshua Green says Trump fell for a media campaign on Ukraine designed to help him: "The irony is that the target was supposed to be the Bidens, not the president."

A slim majority of Americans approve of House Democrats' impeachment inquiry, but even more think President Trump's future should be decided at the ballot box, an NPR/PBS NewsHour/Marist poll finds.

Convicted drug lord Joaquín "El Chapo" Guzmán escaped his maximum security cell through an elaborate, nearly mile-long tunnel, Mexican officials say. NPR's Arun Rath speaks with correspondent Carrie Kahn in Mexico City about Guzmán, his escape and his Sinaloa drug cartel.

A new survey from Sesame Workshop suggests when it comes to talking with kids about things such as race, class and gender, many parents have work to do.

NPR's new series Off Script, which gives voters the chance to sit down with presidential candidates and ask questions, kicks off with undecided voters and former HUD Secretary Julián Castro.

Police say the trio ran one of the country's largest illegal manufacturing vaping businesses. Officials continue to investigate what's behind the deaths and illnesses linked to vaping.