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The former vice president is expected to be tested again on race, as he spars with Sens. Cory Booker and Kamala Harris, the two leading African American candidates, over policing and health care.

NASA is building its most powerful rocket ever, a moon rocket, which will cost billions of dollars. But the effort has sparked debate about whether NASA should rely on cheaper, commercial rockets.

Huntsville, Ala., was one of the key cities that helped NASA get to the moon in 1969. Fifty years later, Huntsville still plays a big role in NASA's present and future space exploration efforts.

The former Trump aide's appearance before the Judiciary Committee is the first time an official from the White House agreed to show up. But Democrats said she declined to answer many questions.

Under the Communist Party's ideological reeducation of China's population, humiliation by foreign powers forms an emotional underpinning of the country's national identity.

Experts say the American West is full of geothermal reservoirs whose energy could power millions of homes. But extracting that energy isn't easy.

U.S. troops are on the ground in Syria training local forces to fight ISIS. But Turkish troops and their local allies are on verge of a confrontation with them.

Students will return to Marjory Stoneman Douglas High School this week for the first time since a gunman killed 17 people. On Sunday, the school is holding an orientation day.

California's senior senator, Democrat Dianne Feinstein, did not receive the endorsement of her party over the weekend. NPR's Ari Shapiro speaks with Los Angeles Times reporter Seema Mehta about why.

The president made an unexpected appearance at Thursday's White House opioid summit. "It's a problem that's growing," he said of the drug epidemic that has struck the country.