The Covid-19 is still spreading devastation across the world, while science is trying to catch up to a too-fast virus, and the available vaccines are at least starting to open the doors to a more active posture, as opposed to a defensive, passive one, against an invisible and very deadly killer. Science is doing its best to uncover the secrets of a virus that, so far, is proving faster that humankind's best weapon, scientific knowledge. It is so fast that it's progeniture, through mutations, is getting more numerous and more potent. Many micro-generations since the discovery of the virus, it's new versions, known as variants, themselves the fruit of series of mutations, are becoming more dangerous than the first known ones. Clearly, the adaptative qualities of that virus are proving impressive, making it more nimble than our science, at least so far. There was the English variant, then the South African one, then the Brasilian one. Now, there's two new ones, both called...