When we talk about the coronavirus it’s the virus part we need to pay attention to. Corona, from the Latin, means crown and is associated with the aurora that surrounds the sun, moon and stars. We also get the word coronary from corona, a constriction of the arteries around the heart. But here Covid-19, coronavirus, is a simple nametag to differentiate it from other viruses, in the same way that ship number 736 in John Brown’s yard was later...