The body of evidence continues to grow: masks protect the person wearing them from COVID-19, in addition to those around them. But with so many choices, what’s your best option? Researchers used a laser beam, a lens that turned a laser beam into a sheet of light, and a mirror that directed light into a dark box made of cardboard. People spoke the same phrase into the box with, and without a mask. The particles that hit the lens produced visible flashes recorded by a phone’s camera on the other end of the box. Regardless of mask-type, fewer coronavirus particles get through to people wearing face coverings, according to a new paper that that will be published in the Journal of General Internal Medicine shortly. Fewer particles could result in milder infections if the virus manages to slip through. Wear as mask!