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Masks Don’t Work: A Review of Science Relevant to COVID-19 Social Policy



Masks and respirators do not work.
by: Denis Rancourt, PhD

There have been extensive randomized controlled trial (RCT) studies, and meta-analysis reviews of RCT studies, which all show that masks and respirators do not work to prevent respiratory influenza-like illnesses, or respiratory illnesses believed to be transmitted by droplets and aerosol particles.

Furthermore, the relevant known physics and biology, which I review, are such that masks and respirators should not work. It would be a paradox if masks and respirators worked, given what we know about viral respiratory diseases: The main transmission path is long-residence-time aerosol particles (< 2.5 μm), which are too fine to be blocked, and the minimum-infective dose is smaller than one aerosol particle.

The present paper about masks illustrates the degree to which governments, the mainstream media, and institutional propagandists can decide to operate in a science vacuum, or select only incomplete science that serves their interests. Such recklessness is also certainly the case with the current global lockdown of over 1 billion people, an unprecedented experiment in medical and political history.

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In this video Dan Dicks of Press For Truth speaks with Denis Rancourt a PHD and former professor of physics at the University of Ottawa about a paper he wrote titled “Masks Don’t Work: A Review of Science Relevant to COVID-19 Social Policy” to discuss the science behind masks, why they don’t work and how society should handle this highly contentious issue moving forward.

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