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A leaked CDC document compared it to the highly contagious children's disease. Data does not support this claim. Nonetheless, the variant is one of the world's most contagious respiratory diseases.

The U.S. stock of flu vaccine was cut nearly in half Tuesday as Britain shut down a major vaccine supplier. Facing a record shortage, authorities are urging healthy Americans to defer getting shots so that medication will be available for those most at risk. Hear NPR's Melissa Block and Dr. Jerry Avorn of the Harvard Medical School.

Below the surface of the sprawling, modern metropolis is a different world. Archaeologists are gaining insights into the city's ancient past by examining the basements of ordinary buildings.

NASA has postponed Discovery's return until Tuesday due to weather concerns. The crew will have several landing opportunities at Kennedy Space Center in Florida, Edwards Air Force Base and White Sands Space Harbor. Here's a look at what the crew's been up to, and information on possible landing opportunities.

Leading members of the far-right gang known as the Proud Boys are facing federal conspiracy charges in the Jan. 6 attack on the U.S. Capitol. Ahead of the riot, members of the group called for "war."

Iran says its attack against Israel was a success. The House plans to hold separate votes on aid for Israel and Ukraine. Supreme Court hears challenge to law used to prosecute Jan. 6 defendants.

What do you do when a friend or loved one talks about race in a way that makes you cringe? Karen Good Marable, Aaron Sanchez, Robyn Henderson-Espinoza and Channing Kennedy tell us how they reacted.

They're made of cotton. Or polyester. Or paper. Or polypropylene. Here's what researchers say about the effectiveness of the different types of face masks during this pandemic.

As if the pandemic weren't enough, people are wondering whether climate change will cause pathogens buried in frozen ground to come back to life as the Arctic warms. How worried should we be?

Among U.S. cities, New Orleans has the third-highest rate of young people who are neither in school nor working. Craig Adams Jr. is trying not to be one of them.