I struggled with this a lot and here's the problem I see. Language works descriptively, and not prescriptively. I like and use short-range aerosols whenever I can, but the public will use airborne hence I've decided that it's better that we do as well, but defining it correctly.
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What I've been telling folks is that, indoors, if sharing an air pocket, keep the mask on regardless of the distance. The topic of children's transmission is very unsettled, but I think kids K-12 can mask up (they do in many countries) and okay if younger ones do it imperfectly.
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Very important to note that in real-world classrooms there are as many "speakers" as there are students in the classroom, something that, as a 6th-grade teacher, I can attest to. (I teach 11th- and 12th-graders in HS physics, and they are much quieter.)
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