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A mysterious die-off of freshwater mussels has biologists scrambling to figure out a cause. Freshwater mussels are critical to river ecosystems and to U.S. water supplies.

NPR's David Greene speaks to Republican House Foreign Affairs Committee Rep. Scott Perry about his takeaways from Wednesday's hearing.

In an interview with NPR, the former vice president said no one warned him about the optics of his son working in Ukraine. Biden also defended calling a voter a "damn liar" in Iowa last week.

A new study finds time-restricted eating helped overweight people who were at high risk of developing Type 2 diabetes to lose about 3% of their body weight, reduce belly fat and feel more energetic.

More pet owners are doing it — sending in dog saliva to find out the genetic history of their dog. Curiosity is one big reason but the test can also help with disease prevention and health promotion.

U.S. employers added a better-than-expected number of jobs last month, boosted in part by the return of General Motors workers who had been on strike in October. The unemployment rate fell to 3.5%.

NPR's Mary Louise Kelly speaks with New York Times reporter John Ismay about his investigation into the deadly history of unexploded cluster bombs accidentally killing U.S. troops that handle them.

NPR's Ailsa Chang speaks with former Senators Trent Lott and Tom Daschle about how they negotiated the rules for the impeachment trial of President Bill Clinton.

The FBI probes Pensacola shooting as terrorism. DOJ's inspector general will weigh in on the early stages of the Russia probe. And, a House panel hearing sets the stage for impeachment charges.

The Justice Department's independent inspector general is set to release the findings of his 20-month review of the early stages of the Russia probe.