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Perspective | We conducted the largest study on masks and covid-19: They work – The Washington Post

The study involving 350,000 people demonstrated that masks are a cost-effective way to reduce infections and that a mask-promotion…

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Because of the lingering uncertainty, we set out last year to conduct the first large-scale study to answer two questions: Can community-wide masking norms be changed in the real world? And does wearing masks measurably reduce community-level coronavirus…

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