Scientists working to create the perfect atomic clock have a fundamental problem: Right now, on the ceiling, time is passing just a bit faster than it is on the floor.
Many companies planned to offer health insurance without hospital coverage because it met requirements of a "minimum value" formula. But the Treasury Department says those plans aren't legal.
More than 67 percent of California is experiencing "extreme drought" or worse. At Southern California's Lake Perris, dry conditions have revealed tractor tires and sunken boats, unseen for decades.
In 10 states, some female prisoners with infants are allowed to care for them. NPR's Arun Rath talks to Jessica Pishko about her reporting for Pacific Standard Magazine on prison nurseries.
The famed musician was one of the most prolific recording artists in jazz and performed with such greats as Ella Fitzgerald and Quincy Jones in a career that spanned decades.
Jeh Johnson, speaking on CNN's State of the Union, said he is taking seriously a video put out by the Somali-based al-Shabab group calling on followers to attack Western shopping malls.
In 1963, Wendell Scott became the first African-American to win a race in NASCAR's top division. No other black driver has won a top NASCAR race since, but the sport is starting to diversify.
The National Park Service has been measuring sounds in nature for a decade. But not all sounds are natural. NPR's Rachel Martin checks in with Kurt Fristrup, who's behind the bio-acoustical project.