The evidence that wearing masks works is statistics. We know that in areas where almost everyone wears masks, there's less spread of COVID-19. Understanding the specifics of why and how that works isn't necessary to know that it does.
Did you know that Florence Nightingale was a statistician? She used statistics to understand what was and wasn't good nursing care, and thus improved nursing care.
And looking at the numbers is how we know that wearing masks works. If people in a community wear masks, that reduces the number of people in the community that get COVID-19. And, yes, you might be one of the people that benefits from everyone wearing masks.
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