A new study highlights the importance of wearing masks.
The study, published online for the scientific journal Physics of Fluids, contains images that show a manikin modeling different masks. Researchers used a fog or smoke machine to simulate "respiratory jets" or droplets from coughs and sneezes.
The pictures visualize how far those droplets can travel with a mask or without one, and how much air bleeds or leaks from the sides or top of a mask that doesn't fit properly.
Dr. Mark Cameron, an infectious disease researcher and professor at °Ç¸çºÚÁÏ's School of Medicine, said the study shows that "mask usage was far more effective than no mask at all."