Do face masks really make a difference?

It seemed like the stuff of a quarantine nightmare. Two Springfield, Missouri, hair stylists at Great Clips tested positive for COVID-19, but not until they'd already given haircuts to 140 clients.  Public health officials prepared for the worst as all those who'd had appointments with the two stylists got tested.

When the results came back, officials were shocked, and relieved. None of the 140 Great Clips customers tested positive. One reason might be that all employees and patrons at Great Clips are REQUIRED to wear masks. This policy annoys some customers, who are sometimes rude to the stylists. But masks may have saved everybody from contracting the virus.