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This article is part of the On Tech newsletter. You can sign up here to receive it on weekdays.The outcome of a vote to form a union at an Amazon warehouse in Bessemer, Ala., Depends heavily on it.My colleague Karen Weise described it as…

Last May, the city of Los Angeles turned a fabled baseball park into a mass test site for the coronavirus. In its prime, Dodger Stadium tested 16,000 people for the virus every day, making it the largest testing site in the world, said Dr.…