The coronavirus (which we're supposed to be calling Covid-19 these days) is causing the world to panic and experience a great deal of anxiety and inconvenience. However, amazing satellite pictures from NASA suggest that it may actually have done some accidental good. OK, so it's not exactly great, but it is something. You see, because China has effectively been on lockdown for weeks now, the pollution that was previously at massively dangerous levels has now subsided dramatically. The two pictures are like night and day - one has large amounts of ominous yellow pollution, the other is a nice calming blue.