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North Korea claimed to have successfully detonated a hydrogen bomb on Sunday, which would be a big development in the country's nuclear program. Also, we have the latest on the U.S. response.

Impeachment hearings continued Wednesday, with Gordon Sondland, President Trump's ambassador to the European Union, taking questions about his involvement pressing Ukraine for investigations.

Dr. Deborah Birx says COVID-19 has entered a new phase. Presumptive Democratic nominee Joe Biden is close to naming a running mate. What the successful SpaceX landing means for space exploration.

In Fairbanks, Alaska, residents are using wood stoves to heat their homes during the frigid winter months. But, smoke created by these wood burners is contributing to some of the worst air pollution in the country. Cathy Cahill discusses air quality in the Last Frontier.

Two apparent explosions have rocked the finish line at the Boston Marathon, about three hours after the winners crossed the finish line. The explosions occurred as thousands of runners finished running 26.2 mile course at the 117th Boston Marathon. NPR's Tovia Smith provides an update.

Microbes may once have happily existed on the surface of Mars, according to chemical analysis of a sedimentary rock in the Red Planet's Gale crater. NASA geologist and exobiologist David Blake discusses evidence for an ancient freshwater lake in the crater, and describes the mineral-chomping microbes that may have thrived there.

Coastal communities will need massive amounts of mud and dirt to protect their shorelines from rising seas. One federal agency has it, but most is disposed of instead of reused.

The YouTube hit is the brainchild of stand up comic Nigel Ng, who's in the middle of a world tour. But can he stand out beyond his character?

U.S. imposes sanctions after Moscow recognizes two enclaves in Ukraine as independent. Ukraine says internationally recognized borders would remain that way. Donald Trump launches a social media app.

Swamped by thousands of calls a day, contact tracing programs have been forced to adapt. Even though they can't call everyone, experts say it's too early to give up on this pillar of disease control.