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The Mars rover Opportunity is getting on in years. It has been on Mars' surface for over a decade, and now it's having memory problems. NASA has come up with a plan to fix it.

A whale researcher has a new hypothesis about orca whales: Whale "midwives" may be assisting births.

The new Senate majority leader will soon take office. NPR's Eric Westervelt asks Alec MacGillis, author of The Cynic: The Political Education of Mitch McConnell, what his leadership might look like.

Anthony Banbury is stepping down as the head of the U.N.'s Ebola mission. He says the Ebola can't become entrenched in West Africa. And he thinks the fight is heading in the right direction.

A veteran reporter's view on the hot-button issues in the coming year: Police in schools, the fallout from the Vergara case and more.

Some drug users in Philadelphia are reselling syringes they get for free at needle exchanges. That's illegal, but researchers say the practice still helps prevent the spread of diseases like HIV.