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Democratic Concerns Over Minimum-Wage Hike Complicate Covid Aid Bill

As highly transmissible coronavirus variants sweep across the world, scientists are racing to understand why these new versions of the virus are spreading faster, and what this could mean for vaccine efforts. New research says the key may be the spike protein, which gives the coronavirus its unmistakable shape. Illustration: Nick Collingwood/WSJ

Featured video licensed from the Wall Street Journal.

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