A video uses lasers to show how you spit when you talk

Photo by Justin Setterfield/Getty Images Even if you don’t think you spit when you talk, you definitely do — and a new video highlights that spit with lasers. The video, published in The New England Journal of Medicine, showed how the spurts of particles released when someone said “stay healthy” at various volumes. Then, it showed how the particle volume changed when the same person said “stay healthy” with their mouth covered by a damp washcloth.
NEJM visual