https://ocla.ca/wp-content/uploads/2020/04/Rancourt-Masks-dont-work-review-science-re-COVID19-policy.pdfSummary / AbstractMasks and respirators do not work.There have been extensive randomized controlled trial (RCT) studies, and meta-analysis reviewsof RCT studies, which all show that masks and respirators do not work to prevent respiratoryinfluenza-like illnesses, or respiratory illnesses believed to be transmitted by droplets andaerosol particles.Furthermore, the relevant known physics and biology, which I review, are such that masks andrespirators should not work. It would be a paradox if masks and respirators worked, given whatweknow aboutviral respiratory diseases: The main transmission pathis long-residence-timeaerosol particles(< 2.5μm), which are too fine to be blocked, and the minimum-infective-doseis smaller than oneaerosol particle.The present paper about masks illustrates the degree to which governments, the mainstreammedia, and institutionalpropagandists can decide to operate in a science vacuum, or select onlyincompletescience that serves their interests. Such recklessness is also certainly the case withthe current global lockdown of over 1 billion people, an unprecedented experiment inmedicaland political history