Some scientists are calling urgent attention to the way the coronavirus can waft long distances through the air. These are not the droplets that fall to the ground or onto a surface within a few feet. These are tinier gobs of virus, much smaller than a human hair. They can linger indoors, then settle deep in our lungs. Dr. Donald Milton, a respiratory disease expert at the University of Maryland School of Public Health, led a group of scientists pointing to such airborne transmission. Better ventilation helps, Milton says -- at least open the windows and doors, or better yet, move activities outside.