Subject: 🗣💨 😷How Well Do Masks Work? (Schlieren Imaging In Slow Motion!)
🗣💨 😷How Well Do Masks Work? (Schlieren Imaging In Slow Motion!)
July 13th, 2020 at 9:01 am EDTvia PBSHow Well Do Masks Work?Wearing a mask is a cheap and easy way to help stop the spread of airborne infections like COVID-19. It’s also a sign that you want to help pr ...