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Analyzing the chemistry of some ancient teeth has revealed what human ancestors were eating around 3 million years ago.

Public health officials are concerned about increasing polarization among Americans over vaccines.

President Trump has threatened new tariffs on imports from Mexico and Canada starting tomorrow, but the administration says the plans are "fluid." That's a headache for businesses as they try to prepare.

NPR's Ailsa Chang talks with Joe Chenelly, executive director of AMVETS about the stalled confirmation hearing for Ronny Jackson, President Trump's nominee to lead the Department of Veterans Affairs.

The U.S. job market held steady last month — but there are warning signs of possible weakness ahead.

NPR's A Martinez speaks with Peter Feaver, political science professor at Duke University, about the history and symbolism of military parades in the U.S. ahead of Saturday's event in Washington, D.C.

A lawsuit challenging construction and operations of an immigration detention center in the Florida Everglades known as 'Alligator Alley' has wrapped up with several key questions unanswered.

A new study details the evolutionary change of Anna's Hummingbirds, finding their beaks have grown longer and more tapered to get the most from common feeders.

People blame gun violence on different things depending on their political leanings. But Jens Ludwig, an economist at the University of Chicago, has found a different reason behind it. Today, we bring you a story on solutions to gun violence.

The financial crisis in Europe has been one of the most difficult challenges for the continent since it began moving toward greater integration in the wake of World War II.