It's in air. We already know that the way many people are catching the novel coronavirus is by getting too close to droplets - someone's sneeze, cough or, yes, even spit while they're talking. But...more scientists are now saying the virus can also be airborne....that aerosols can hang in the air and float for periouds of time. And those scientists want policy makers to act accordingly. Dr. Linsey Marr is a professor of civil & environmental engineering; expert in airborne transmission of viruses at Virginia Tech University --and-- Jose-Luis Jimenez, professor of chemistry & biochemistry at the University of Colorado, Boulder