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Historian Mary Elise Sarotte tells how NATO expanded into Eastern Europe after the fall of the U.S.S.R, and is now obligated to defend nations near Russia's war in Ukraine. Her book is Not One Inch.

Artificial intelligence experts recently signed an open letter warning that AI could destroy humanity. New York Times reporter Cade Metz explains why we are at a turning point with this technology.

New York Times correspondent David Kirkpatrick says the Obama White House watched Arab democracy fall, and now the Trump administration is embracing Egypt's autocratic president.

New York Times science writer David Wallace-Wells says the cost of solar and wind energy has fallen dramatically. Nevertheless, we're still facing painful, long-lasting changes to the planet.

DOGE has eliminated thousands of federal jobs and canceled more than 1,000 contracts. Harvard professor Elizabeth Linos warns, "We're seeing harms that are not going to be easily undone."

Dan Taberski won a "Podcast of the Year" award for his investigation of a 2011 outbreak of tics and spasms in one high school. He's also the creator of the "Missing Richard Simmons" podcast.

There may be no better case for the power of hip-hop's geographic diversity than Los Angeles, whose sprawl of distinct creative microclimates is a genre unto itself.

The investigation into Chinese political elites would "wipe out everything we've tried to build there," Matthew Winkler, Bloomberg's editor-in-chief at the time, said on audiotape obtained by NPR.

President Biden addresses the Omicron variant in a speech Tuesday. Some health officials say Biden has fallen short on COVID testing. The Pentagon is updating its policies on extremism in its ranks.

The Fed is moving toward raising interest rates next year. The latest coronavirus variant is proving to be highly transmissible. We examine the impact of Kentucky's tornadoes on children.