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It sounds like it's recommended because a significant portion of people with coronavirus are asymptomatic or pre-symptomatic, and the virus can spread through speaking, coughing or sneezing.

There's no "proof" that these work, but there's a hope that it helps along with hand washing and a distance of six feet.

Diamond, L. (2020, June 13). Democracy Versus the Pandemic. https://www.foreignaffairs.com/articles/world/2020-06-13/democracy-versus-pandemic

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Le regard des parents sur l’école à distance Ifop pour Break Poverty Foundation

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