When you think about it, I don`t think masks have ever been designed
explicitly to keep stuff in.
As far as I know masks have traditionally been designed to keep stuff out.
Keeping stuff in is a new concept.


On Sun, Aug 9, 2020 at 5:29 PM Jed Rothwell <jedrothw...@gmail.com> wrote:

> This is off-topic, but important.
> It turns out that cheap, throw-away "surgical mask, 3-layer" type masks
> work best. These are the ones you can buy anywhere nowadays. Office Depot
> sells them cheap.
> See this research article in Science:
> https://advances.sciencemag.org/content/early/2020/08/07/sciadv.abd3083
> Knitted and bandana types are not recommended.

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