there have been thousands upon thousands of scientific procedures and all prove its real.
please stop getting your stupidity from conspiracy sites.

and no there is no WHO conspiracy because even countries indepenadent of CDC/WHO have done studies and decentralised review and found covid is real
again please stop searching idiot conspiracy sites and instead look at the research
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common sense tells you if you are about to sneeze. putting a tissue infront your nose is enough to capture your sneeze and prevent someone standing a metre infront of you from getting a face full of snot and fluid.

common sense tells you if you are in a housefire. covering your face with a piece of fabric filters out most of the nasty stuff you can inhale. yes you breathe easier in a smokey room if you cover your face

common sense tells you if someone farts. covering your face limits how much stink you smell..
so face coverings do work both for you on the receiving end of nasties and you on the transmitting end of nasties

and yes in all examples above distance helps too

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scientifically its proven too. pre march lockdown the R rate was over 3. and the ratio of assymptomatic:symptomatic was high with more people getting sick per population number
then with just social distance lockdown. this brought the R rate down. and masks/facecoverings brought down the ratio of asymp:symp