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Get ready to learn more Greek letters.... Every infection provides a chance for the virus to mutate, and Omicron has an edge over its predecessors: It spreads much faster despite emerging on a planet with more immunity from vaccines and prior illness. More spread means more people in whom the virus can further evolve.... Advertisement Newsletter Get our free Coronavirus Today newsletterSign up for the latest news, best stories and what they mean for you, plus answers to your questions. Enter e