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Breathing problems. It's not good to breath Co2 all day long. This is proven among all of us.

Not to mention the psychological issues.

Snowflake

Yes.

I think masks are best seen as a low cost annoyance that lessens transmission by an unknown degree. It may be minor, it may be more than that, but there is a decent amount of evidence that they do provide a positive benefit at a relatively low cost. That said, it becomes easy to be seduced by the idea that we need them forever, as COVID will last forever, and this is not a great conclusion.

Hmm...

Three refrain has been that masks are useless because the virus is so much smaller than the weave of the mask, right?

What's smaller? A virus cell or a molecule of CO2?

I'd guess this is rhetorical.  I did a bit of work in filtration back in the day.  It's fairly complex, and one means of filtration is called "interception" which is how most thing filtration works, but that is not the only mechanism.  A coarser weave than the particle can still filter a particle reasonably well by other mechanisms, electrostatics being one of them.

A mask, to me, is like covering your mouth when you sneeze or cough, but more consistent and effective at stopping droplets from being sprayed around.  Even loud speech sprays droplets outward, which can carry virus to others.

We had a remarkably low flu season this past year, it's worth thinking about why.  There were more vaccinations for flu.

We had a remarkably low flu season this past year, it's worth thinking about why.  There were more vaccinations for flu.

I have a theory.

China was closed to the world, therefore it could not escape from there, as usual.

Our kids have not worn masks at school since March. 

Our kids have not worn masks at school since March.

Florida has not required them in schools since last June.