We’re learning more about how the virus that causes Covid-19 is spread from person to person. For the most part, it happens when we’re in close contact with an infected person, who emits tiny liquid particles by coughing, sneezing, speaking or singing. You get sick by inhaling the droplets, or having them travel into your ears or nose. But researchers are looking at another way it may be transmitted. Jason Gale reports that virus-laden aerosols, floating in gas clouds, might be capable of infecting us.