A child is seen in a corridor of the primary school number 25 in Warsaw on the first day after the Polish authorities allowed the youngest children to leave home education and return to school, amid the novel coronavirus / Covid-19 pandemic in Warsaw, January 18, 2021. - Poland's youngest children returned to school for the first time in over two months but most pupils will remain in virtual classrooms as experts warned of a growing psychological toll. (Photo by Wojtek RADWANSKI / AFP)