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https://theblueeconomy.blog/2020/10/30/aerosol-transmission-of-covid-19-a-room-a-bar-and-a-classroom-how-the-coronavirus-is-spread-through-the-air-society-el-pais-in-english/
Aerosol transmission of Covid-19: A room, a bar and a classroom: how the coronavirus is spread through the air | Society | EL PAÍS in English