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NPR's Rachel Martin talks with Alex Gansa, creator and executive director of the series Homeland, about the show's new season and how it has evolved to reflect the geopolitical landscape.

A small cylinder called Le Grand K has defined the kilogram for more than a hundred years. But if a scratch ever rendered it lighter, the definition of the kilo literally shifted. Time for a change.

More than 250,000 have been driven out of their homes as the state was engulfed by five identified fires, from north to south.

The number of people graduating with nuclear engineering degrees has more than tripled since 2001. Many say they are motivated by climate change.

The scarcity of rural vets, who are the first line of defense against diseases that can spread from animals to humans, means sick and infected animals could increasingly go untested.

Kansas had one of the strictest voter registration laws in the U.S. But a federal judge says it's unconstitutional — and she is requiring Kris Kobach to take legal classes to brush up on the rules.

If the first weekend's big matches had a lesson, it was that even great teams don't win every game. The Davids were stronger than expected, and the Goliaths were weighed down by sky-high expectations.

Four people are dead and eight people were injured in the shooting. Deputies who responded to the scene engaged the attacker in a shootout in a classroom building.

For the first time, Medicare penalties against hospitals with too many avoidable patient safety complications include fines tied to the prevalence of two types of bacteria resistant to drugs.

The Black contralto put European art music and African-American spirituals in parity — and in her art, paved the way for generations of singers after her, both inside and outside classical music.