As the third winter of the coronavirus pandemic looms in the northern hemisphere, scientists are warning weary governments and populations alike to brace for more waves of Covid-19. In the United States alone, there could be up to a million infections a day this winter, said Chris Murray, head of the Institute of Health Metrics and Evaluation (IHME), an independent modeling group at the University of Washington that has been tracking the pandemic. That would be around double the current daily tally. Across the United Kingdom and Europe, scientists predict a series of Covid waves, as people spe…