That's why the message must be clear: even if it protects a single wearer just 20%, it can provably have huge benefit to everybody, but only if everybody does i

That's why the message must be clear: even if it protects a single wearer just 20%, it can provably have huge benefit to everybody, but only if everybody does it (1) while all that doesn't mean that other measures could be avoided (2), especially if R raises in spite of one single measure. 1) https://news.ycombinator.com/item?id=25301380 https://news.ycombinator.com/item?id=25301380 2) The Swiss cheese model of how defences, barriers, and safeguards may be penetrated by an accident trajectory (see the figure): https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1117770/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1117770/ https://www.wsj.com/articles/how-the-swiss-cheese-model-can-help-us-beat-covid-19-11605283134 https://www.wsj.com/articles/how-the-swiss-cheese-model-can-...