Coronavirus - Face masks are 'tremendously effective' at curbing the spread of Covid-19 - here's the evidence

Coronavirus - Face masks are 'tremendously effective' at curbing the spread of Covid-19 - here's the evidence

Coronavirus - Face masks are 'tremendously effective' at curbing the spread of Covid-19 - here's the evidence

User: National World - News and sport explainers

Views: 1.7K

Uploaded: 2020-10-06

Duration: 01:28

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