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A new study sheds light on a longstanding ecological question: How do so many species like impalas and elephants co-exist when they're all feeding on the same limited foods?

NPR's Melissa Block speaks with John Pistole about the report that found 95 percent of recent covert tests of airport screeners were able to get past security.

Twenty-year-old Bella King talks about what it was like for her to grow up and come out as transgender.

A group pushing Elizabeth Warren to run for president moves on and "declares victory" in advancing her positions. But Warren is already on to new fights.

NewscastSMPA gives back 1.7 million to customersMesa County checks to see if anyone watches public accessUS Forest Service releases plan for beetle…

In Nairobi, people don't like getting into cabs driven by strangers. They prefer to call drivers they know or who their friends recommend. A new app assigns drivers a trust score based on social ties.

Hospitals in some states have begun tracking the names of patients who show up repeatedly seeking opioids. Denying these patients pills saves hospitals money, but some doctors question the ethics.

Before awarding compensation, the court wants a "preponderance of evidence" that a vaccine caused the injury. Some years, the nearly $4 billion fund earns more interest than it pays out in claims.

Bush, who is likely running for president, is a firm Catholic. But that might not be enough for evangelical Christians in Iowa who see him as moderate and are looking elsewhere.

Machines have been taking jobs forever. Computers and software are doing things people were paid to do. They are booking airplane flights. Filing our taxes. And they are getting better all the time.