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After the InSight lander had trouble drilling a sophisticated thermometer into the Martian surface, a Plan B also didn't work, and the instrument ended up backing itself out of the ground.

The Pentagon is ramping up its support of Ukraine in its war against Russia. The Defense Department is sending another $3 billion to Ukraine. That brings total U.S. aid to more than $13 billion.

Chicago is on the brink of choosing a new mayor in a run-off election this Tuesday, after incumbent mayor Lori Lightfoot lost in the first round.

Environmental groups raised concerns the Oroville Dam had structural problems more than a decade ago. But California and federal officials dismissed the issues they raised.

The U.S. is giving $1.6 million to researchers to study how the hepatitis B vaccine affects newborns in Guinea-Bissau. After an outcry, the future of the trial is up in the air.

After a massive Boston-area manhunt for the suspect in the marathon bombings, police closed in on a boat in a Watertown backyard where the 19-year-old was hiding. The dramatic resolution came shortly after police announced they did not believe the suspect was in the area.

The Labor Department on Friday said the nation's jobless rate fell to 6.7 percent as U.S. employers added 74,000 jobs to payrolls while more Americans stopped looking for work in December. In November, the unemployment rate was 7 percent.

On 9/11, 38 planes were rerouted to Gander, Newfoundland. More than 6,000 passengers and crew were taken in by families there. Their story is the subject of a new musical called, Come From Away.

More than 150,000 U.S., British and Canadian troops stormed the beaches of Normandy, France, on June 6, 1944 — 80 years ago this week. A small handful told NPR about their experience.

Early Wednesday morning brought a lunar event that hadn't been seen since 1866. Scientists say data gathered during the event could help them figure out where to land a rover on the moon.