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Scientists are experimenting with species' environmental DNA to find out how far and how fast it travels in streams. The technology is starting to revolutionize how we protect native animals.

A day after criticism and chaos for some caused by his executive order temporarily banning Muslims from seven countries, the president took to Twitter Sunday morning to defend himself.

In the Syrian desert near Jordan's border, some 60,000 refugees live in dire conditions. A trip with the Jordanian military provided a glimpse of the Rukban camp. Few outsiders have seen it.

"There is no greater ... feeling of helplessness than to watch two beloved sons deteriorate before [your] eyes," says Ron Powers. His new book is No One Cares About Crazy People.

Donald Trump wants to punish local law enforcement that doesn't cooperate with immigration law, but the decisions to enforce are varied, and some worry it could lead to abuse.

Justice Anthony Kennedy appears likely to cast the deciding vote in a Supreme Court case involving a death row inmate's right to help from a mental health expert who is independent of the prosecution.

Most tortillas in the U.S. are made with mass-produced corn flour. But specialty ingredient company Masienda is providing American chefs with heirloom corn grown in Mexico for its richer flavor.

Plus a bill for "Dreamers" and a former for-profit college lobbyist leaves the Education Department.

"Their faces had turned yellow and they had stopped breathing," a Syrian activist tells NPR. "As I'm describing the incident to you now, my hands are shaking. No, my whole body is shaking."

A rapidly evolving strain of bird flu has killed a record number of people this year in China. Scientists are concerned about its potential to spur a global pandemic.