Tomasz Ziewiec, a headmaster of the primary school number 25 in Warsaw, is seen in a school corridor 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)