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NASA is building a 2-pound helicopter drone that would help guide the vehicle on the Red Planet's surface. That way, the rover wouldn't need to wander as much to find its way around.

North Korea's state television says a hydrogen bomb was detonated. Renee Montagne talks to Daniel Pinkston, a Korea expert recently with the International Crisis Group.

Many groups are battling for control of Syria's second largest city. The Free Syrian Army has its main headquarters here. Middle East analyst Andrew Tabler explains the strategic importance of Aleppo.

At least 18 people have died in attacks at a bar and a concert hall in Paris. There are also reports of explosions near the French National Stadium where France was playing Germany in a soccer match.

An early pioneer in American pet photography, Frees died in poverty and obscurity.

Europe has extracted natural gas from organic waste for about a decade, and now it's spreading to the U.S. In Colorado, efforts are under way to produce natural gas from human waste and food scraps.

Vice President Joe Biden is still weighing whether to run for president. But a superPAC trying to draft him is upping the ante with a TV ad set to run around the time of the first Democratic debate.

In his speech kicking off a NATO meeting, Secretary-General Jens Stoltenberg also said the alliance will establish two "small headquarters" in Hungary and Slovakia.

One analyst finds that economics is the key driver behind the growing phenomenon of so-called "cord-nevers," people who never subscribed to cable or satellite TV.

Could the rumor be true: Is Netflix reviving Gilmore Girls? NPR's Rachel Martin turns to the hosts of the Gilmore Guys podcast to find out what fans want — and if the cast can pull it off.