The United Nations says 117 million students worldwide are still out of school due to the coronavirus pandemic that began more than a year-and-a half ago. In a statement Thursday, the United Nations Educational, Scientific and Cultural Organization said the number of students who have yet to return to the classroom represents about 7.5% of the global student population. “We know that the longer schools stay closed, the more dramatic and potentially irreversible the impact on children’s well-being and learning, especially for the most vulnerable and marginalized,” said Assistant UNESCO …