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The U.S.-funded aerial spraying program has been aimed at killing the plants that feed the cocaine industry. Colombia says one of the chemicals in the spray may cause illnesses.

GOP presidential hopefuls converged in Iowa for the Lincoln Day Dinner. More candidates are entering the presidential race, in part, because there is no obvious next-in-line for the GOP nomination.

Women with dense breasts are more likely to get cancer and less likely to catch it early on a mammogram. But degree of density matters too, a study finds, as do other factors like family history.

What if microbes could ferment sugar into narcotics, like the way yeasts make beer? That day is quickly approaching. This week scientists report all the steps needed to make morphine in yeast.

Last month, the U.S. Alcohol and Tobacco Tax and Trade Bureau approved a powdered alcohol product, making both parents and lawmakers nervous. Some states have already banned powdered alcohol. NPR's Arun Rath speaks with Brent Roth of Wired, who made his own powdered concoction and put it to the test.

Pediatric neurosurgeon Ben Carson is set to formally announce his candidacy for president in Detroit on Monday. Also getting into the mix on Monday is former Hewlett-Packard CEO Cary Fiorina.

The annual Man v. Horse Marathon in Wales sounds like a lopsided contest favoring racers with four feet. But scientists say that Homo sapiens evolved to be incredible endurance athletes, too.

An important part of Detroit's skyline is on the auction block — the 29-story Fisher Building. The bank foreclosed on it, and next week, it goes up for sale online.

NPR's Robert Siegel talks to Helene Elliott of the Los Angeles Times about the Stanley Cup. The series is tied 2-2, as the Chicago Blackhawks and Tampa Bay Lightning prepare for game five on Saturday.

When Hillary Clinton moved to New York to run for Senate, New Yorkers were suspicious that she was one of them. Now that she's running for president, the city's residents call her one of their own.