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A second E.coli outbreak at the Chipotle has food safety experts perplexed. NPR's Linda Wertheimer talks to reporter Joanne Silberner about why it's been so hard to identify the contamination source.

NPR's Linda Wertheimer speaks with William Burr of the National Security Archive about the release of formerly classified documents detailing U.S. nuclear targets during the Cold War.

It's been a year of protests with demonstrators taking to the streets across the nation. Fatal shootings involving police have forced investigations, the ouster of a police superintendent and others.

How many trees are there in the world? Some scientists are working on a new estimate.

As part of the encore airing of NPR's "Journey Home" series on the presidential contenders, we go to the town in Texas where Rand Paul grew up.

From photos of far-flung Pluto to space lettuce, it's been an exciting year for developments in space. NPR Science Correspondent Geoff Brumfiel shares three highlights with host Linda Wertheimer.

NPR's Linda Wertheimer has covered decades of presidential elections. She reflects on what to expect from 2016.

"Making Africa" at the Guggenheim Bilbao has old-meets-new portraits, startling videos and futuristic glasses.

Mexican chef Pati Jinich shows NPR's Carrie Kahn how to handle those Christmas dinner turkey leftovers. She shows us how to make a mouthwatering pibil sauce for next-day sandwiches and enchiladas.

First Lady Michelle Obama collaborated on a rap video encouraging high school seniors to go to college. That gave way to #FLOTUSbars.