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A contrast agent doesn't make you feel better or treat what's ailing you. But by making CT scans clearer, contrast might be crucial in helping your doctor make the right diagnosis.

Mind Fixers, by historian Anne Harrington, takes a hard look at the ways the marketing of a new pill to treat a mental disorder can change the way the condition is defined and treated.

NPR's Rachel Martin talks to Pulitzer Prize-winning journalist Jose Antonio Vargas for a response to a story in The Atlantic, written by David Frum, proposing the U.S. cut legal immigration by half.

The questions and answers you need in order to prepare for the arrival of the hottest new 400-page document in Washington.

In one year, fertilizer production in the U.S. emitted as much carbon dioxide as two million cars. What if we could help plants make their own nitrogen so they wouldn't need man-made chemicals?

In many parts of the world, the rate of HIV infection is declining. But not among the indigenous peoples of this Central American country.

Facebook has become ubiquitous in the past 14 years, but it may not dominate forever. Some experts are already designing the next social networks — and they look a lot different.

Do you have to vote even if you don't want to? Not doing so could put you on the path to losing your vote in some states.The U.S. Supreme Court is…

After Hurricane Maria, Christine Nieves started the Proyecto de Apoyo Mutuo Mariana to feed a community that was devastated by the storm. They still offer one meal a day.

Reynolds, who died Thursday, appeared in scores of films, including Deliverance and Boogie Nights. He spoke to Terry Gross in 1994 about growing up the son of a sheriff in a small Florida town.