How Well Do Masks Work?

Slow motion video explains how different masks work to stop the spread of COVID-19.

“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 protect other people and have them protect you… that we’re all in this together. Here’s some awesome slow-motion schlieren imaging experiments to demonstrate why masks work!”

[Youtube]