Black diamonds are extremely rare, and are found naturally only in Brazil and Central Africa. The cosmic origin theory of "The Enigma" is based on carbon isotopes and high hydrogen content.

Rev. Martin Luther King Jr. would. have turned 93 on Jan. 15. He was just 39 when he was assassinated in 1968 in Memphis, Tenn.

Explosions in Abu Dhabi killed three people near fuel trucks. Houthi rebels claim they've struck the United Arab Emirates for its fight against them in Yemen and the UAE promises to respond.

Retired Brigadier General Charles Edward McGee, a member of the all-Black Tuskegee Airmen who flew during World War II, has died. He was 102.

The Red Cross has, for the first time, declared a national blood donation crisis. Some hospitals say they're rationing blood products. And blood banks are scrambling to encourage donations.

NPR's Audie Cornish talks with civil rights activists about what it was like to fight for the Voting Rights Act in the 1960s — and the rights that are in jeopardy now.

NPR's Mary Louise Kelly speaks with Mary Mayhew, president of the Florida Hospital Association, about how the state's hospitals are navigating the Supreme Court's decision on vaccine mandates.

On Sunday, Keira D'Amato, 37, broke the American marathon record after she finished in just over 2 hours and 19 minutes. She is a mother of two and a real estate agent.

NPR's Mary Louise Kelly chats with Kholood Khair, managing partner of a think tank in Khartoum, about ongoing pro-democracy protests in Sudan.

Frustration is growing among people who depend on public transportation as employees quit and agencies make major cuts. In St. Louis, Mo., a transit agency is losing far more operators than usual.