From a driveway in the Snoqualmie Valley, buddies Jeff Kissick and Gavin Pendleton – former U.S. Marines, now married with five school-age kids between them – were out to prove a point. Part chemically-burned tongue-in-cheek and part serious, the men say their experiment was designed to show the relative efficacies of a military gas mask, a KN95 mask and the more common paper or cloth masks most students in Washington state use in school. That’s why they staged their own scientific experiment complete with a military-grade gas mask, canopied tent and one can of honest-to-goodness bear spray. Before videotaping their...