Facemasks have become big drivers of e-commerce. In August, Etsy’s quarterly earnings report showed mask sales on the site reached $346 million in the second quarter of 2020. During the same period, face mask sales netted the struggling retailer Gap Inc. $130 million. And the global mask market is projected to grow to $2.3 billion by 2027. Cloth and paper masks routinely make best seller lists on Amazon in multiple categories including “Tools & Home Improvement,” “Health & Household,” and “Beauty & Personal Care.” But are all those products equally effective at stopping COVID-19? There is a growing scientific consensus…

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