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Zika disease has been on the rise in tropical countries like Brazil, where it's suspected of causing birth defects. Dr. Peter Hotez, dean of the National School of Tropical Medicine, explains more.

A top EPA official resigned Thursday over the handling of the ongoing water contamination crisis in Flint, Mich. The role of the EPA and whether the federal agency should have done more has been a recurring theme in White House discussions this week.

Passaic River polluters are telling local fishermen to trade contaminated catch for healthy tilapia. But there's no disposal plan for the toxic fish, and residents don't want them to be incinerated.

A movement to take back Nevada land that some ranchers want for grazing has stopped federal workers from safeguarding public property, say groups that would prefer to see the area protected.

Users say the driver-passenger relationship is different: Lyft is "your friend with a car"; Uber is "everyone's private driver." Still, competition is so great that Uber wooed rival drivers covertly.

Hospitals are on the front lines of the battle against antibiotic resistance. Increasingly, they're trying to walk the talk by purchasing meat from animals raised without antibiotics.

Investigators want to know if the company deceived investors and the public about risks associated with climate change. The company protests that it has included those risks in its reports for years.

The flooding overwhelmed houses, leaving a coating of mud — and in one case, setting a car atop a structure's walls. Rescue crews are still looking for survivors. At least one person has died.

President Obama's rejection of the Keystone XL pipeline provoked cheers from environmental groups and a little bit of head scratching in the state of Texas.

NPR's Scott Detrow talks with host Scott Simon about the politics, perceptions, and reality of President Obama's move to reject the Keystone XL pipeline project.