Like this.... https://www.fast.ai/2020/04/13/masks-summary/">https://www.fast.ai/2020/04/1...
Masks for all? The science says yes.

Most scientific evidence points in the same direction: keep your droplets to yourself – wear a mask

https://www.fast.ai/2020/04/13/masks-summary/
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And this thread https://twitter.com/jeremyphoward/status/1249698787666399235?s=19">https://twitter.com/jeremypho...
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