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Помогают ли маски? How Well Do Masks Work?
Science & Technology
science
joe hanson
schlieren optics
schlieren
masks
face masks
face mask
covid-19
coronavirus
covid
pbs
pbs digital studios
it's okay to be smart
it's ok to be smart
its ok to be smart
its okay to be smart
coronavirus pandemic
Uploaded by: Rokinso
Views: 57.396