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Iowa doesn't represent the United States demographically. So why does it play such a big role in the presidential nomination process?

Millions of monarch butterflies migrate to the mountains of Mexico each winter. Authorities are now investigating the apparent murders of an activist and tour guide at the Michoacán reserve.

Brains affected by autism appear to share a problem with cells that make myelin, the insulating coating surrounding nerve fibers that controls the speed at which the fibers convey electrical signals.

When's the last time you checked in with your primary care provider? U.S. adults under age 65 made nearly 25% fewer visits to primary care providers in 2016 than in 2008, a big study finds.

Minutes away from the start of the Iowa caucuses, NPR's political team is the Midwestern state with the candidates — and also in the studio awaiting results.

The first-term Democrat from El Paso, Texas, was thrust into the spotlight last year because of the Trump administration's immigration policies and a mass shooting that targeted Latinos.

An art installation in Chicago honors victims of gun violence, and its organizers hope to make it a national monument. They want to bring widespread attention to what they consider another epidemic.

Iowans are waking up to a surprise turn in their first-of-the-nation vote: no results. Technical issues and inconsistencies have kept Democratic Party officials from reporting their results.

Researchers tried to help low-income workers sign up for free money with letters and text messages. They failed.

A 39-year-old man is only the second person to have died from the infection outside of China. Hong Kong health workers are striking to demand the border with mainland China be sealed.