In the midst of renewed calls for universal masking in the name of Covid-19, can we have a reasoned, data-oriented discussion of how well universal masking prevents Covid deaths? Universal masking harms people and harms society. To justify such harms, I expect strong evidentiary support for the theory that universal masking prevents a significant number of Covid deaths.

Universal masking harms people. Many mask wearers experience anxiety, increased blood pressure, difficulties breathing. Universal masking cuts off much if not most interpersonal communication for many people, and interferes with the ability of children to learn and to develop social skills.