The vicious enemy that has forced billions of people into hiding in their homes is a tiny ball measuring about 70 millionths of a millimeter, making it to a human being what a chicken is to the entire planet. And this is humanity’s great adversary. Known to scientists as SARS-CoV-2, the novel coronavirus is just a very short message written in different combinations of the same four letters. Each letter is the initial of a chemical compound containing different amounts of carbon, hydrogen, nitrogen and oxygen. It is these four letters (a, u, g, c) that have written the code that has killed more than 300,000 people since it was first was detected little more than four months ago.