The Black teenager was killed Nov. 23 by a white middle-aged man who confronted him for playing loud music. Ellison's death is causing soul searching in the mostly white community where he lived.

Researchers found that a class of antibodies in a monkey's blood provides protection from COVID-19. If that hold true for humans, a blood test may predict whether a vaccine candidate is working.

Mass vaccinations will start less than a week after the U.K. approved the new drug. Welsh First Minister Mark Drakeford says it could start "a long path back to normality."

Seventy years on, war participants are drawing starkly differing conclusions from the Battle of Chosin Reservoir. The decisive conflict's lasting legacy is still visible on the Korean Peninsula.