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In this December 20, 2019, file photo, anti-government demonstrators run from a cloud of teargas during clashes with police in Santiago, Chile. Last year, face masks were an act of rebellion, a signature piece of clothing associated with protesters in who wore them to protect against tear gas or to conceal their identities from authorities. These same masks are now ubiquitous around the world – worn by people from China and Iran, to Italy and America, seeking to protect against the coronavirus. The vast majority of people recover from the new virus. (Photo by Fernando Llano/AP Photo)
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