At the moment, we are getting an astonishing insight into the action of evolution by natural selection. It is operating in just the way that Charles Darwin would recognise, especially if he was given a copy of Mendel’s paper about the peas; but it is happening at a speed which means we can see it happening. Instead of species changing over decades or centuries or millennia, it’s happening in viruses in days and weeks.
Can the vaccine keep up with the Covid variants?
