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@feld @freemo

How does the virus spread? Mostly by riding on tiny water droplets coming out of your mouth and nose, which the mask catches by absorption

This is a model that may makes sense but in the end it leads to the wrong conclusions, as proved by the systematic review by Cochrane.

Perfect is the enemy of good.

Read the review: the effectiveness of masks is close to zero, not 90%, nor 50% and nor 10% as you seem to imply.