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CDC Director Rochelle Walensky has signed off on updated versions of the Moderna and Pfizer-BioNTech vaccines that target the original virus and the omicron subvariants.

Pope Francis celebrated Mass before tens of thousands of people, to close out an unusual mission by Christian religious leaders to nudge forward the South Sudan's recovery from civil war.

The government has declared three days of national mourning after a head-on collision between a passenger train and a freight train killed at least three dozen people and injured some 85.

Rising insecurity and economic uncertainty in Nigeria are increasingly having an impact on retirees' decisions not to return home to live out their twilight years in the country of their birth.

Some big states have been moving to limit the numbers of people they send to solitary, but officials say it's necessary to maintain control and, in some cases, protect the prisoners themselves.

Retail sales dipped 0.4% in February after a surprise start-of-the-year surge that appeared at odds with the Federal Reserve's goal of cooling down the economy.

The nation's jobless rate is up to a 26-year high of 9.5 percent. The Labor Department says 467,000 jobs were eliminated last month. June's payroll reductions were deeper than the 363,000 that economists expected.

Government troops are locked in a fierce battle with Russian-backed separatists, while civilians suffer freezing cold. Correspondent Corey Flintoff shares the latest with NPR's Scott Simon.

The Obama administration set a self-imposed deadline of the end of November to have the major kinks worked out in HealthCare.gov, the website at the center of implementation for the Affordable Care Act. In the hours before its deadline, the site was taken offline for repairs. But the White House says the site is in much better shape than it was two months ago, when it launched and promptly failed to work for most users.

Do people with Ebola actually cry tears of blood? What happens if the U.S. Army thinks you might have Ebola? We catch up with science writer David Quammen to discuss truths and myths about the virus.