Bill Chappell








Moderna says tests show that its COVID-19 vaccine offers protection against new variants of the coronavirus but that the vaccine is more effective against the variant first identified in the U.K. than the one found in South Africa. As a result, Moderna will test booster doses of its vaccine, including one that would be tailored to fight strains that have recently emerged.

Merck is halting development of its two COVID-19 vaccine candidates, saying that while the drugs seemed to be safe, they didn't generate enough of an immune response to effectively protect people against the coronavirus.

Updated at 3:10 p.m. ET

Hank Aaron, seen as a hero for shattering Babe Ruth's home run record and also for his longtime advocacy for civil rights, has died. "Hammerin' Hank" was 86. The Atlanta Braves confirmed his death on Friday.

A U.N. treaty outlawing nuclear weapons went into effect on Friday, having been ratified by at least 50 countries. But the ban is largely symbolic: The U.S. and the world's other nuclear powers have not signed the treaty.

"For the first time in history, nuclear weapons are going to be illegal in international law," Elayne Whyte, Costa Rica's former U.N. ambassador who oversaw the treaty's creation, tells NPR's Geoff Brumfiel.

Updated at 10:06 a.m. ET

