>"Scientists now have to untangle what advantage those changes might give variants found in the U.K., South Africa, and Brazil."For most of 2020, the coronavirus that causes COVID-19 jumped from human to human, accumulating mutations at a steady rate of two per month—not especially impressive for a virus. These mutations have largely had little effect.

>"The most concerning versions of the virus are not simply mutating—they’re mutating in similar ways."

>"The most concerning versions of the virus are not simply mutating—they’re mutating in similar ways."