currentbias, If the body could evolve the means to filter the air it needs, it would. This would be a really intelligent adaptation for the immune system to make, like RNase on skin (the stuff that destabilizes RNA on contact)
Wearing a respirator is an externalized form of this adaptation. It is quite literally adding a layer to your immune system. The immediate tradeoff is a negligible amount of breathing resistance
#WearAMask #WearARespirator #CovidIsAirborne #CovidIsNotOver
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