Like th e meme said.. if underwear and jeans can’t keep a fart in how is a cloth mask going to keep a virus out.
They don’t work period and were never designed to keep anything out, they (N95) were originally designed to help keep surgeons from contaminating patients during surgery.
Yes, they do:
Good layman’s summary of the science behind mask-wearing:
A second layman’s article on the science behind mask-wearing:
https://www.bbc.com/future/article/20200504-coronavirus-what-is-the-best-kind-of-face-mask
Particle sizes stopped by masks:
https://pubs.acs.org/doi/10.1021/acsnano.0c03252
Composition of saliva (the microdroplets generated by coughs and sneezes):
https://www.thejpd.org/article/S0022-3913(01)54032-9/fulltext
Size distribution of microdroplets generated by sneezing:
https://royalsocietypublishing.org/doi/10.1098/rsif.2013.0560
More about droplets and aerosols:
https://first10em.com/aerosols-droplets-and-airborne-spread/
Still more about droplets and aerosols:
https://www.ncbi.nlm.nih.gov/books/NBK143281/
And still more about droplets and aerosols:
https://www.ncbi.nlm.nih.gov/books/NBK143281/
Positive pressure face mask (for hypoxia sufferers):
https://cleanspacetechnology.com/us/cleanspace2/