DETROIT At one point, more than 90% of the worlds schools were partially or fully closed because of the coronavirus (COVID-19) pandemic, but now, many are starting to reopen. While most schools in the United States are shifting into summer vacation mode, many nations around the world have reopened their classrooms. So far, about 40% of the worlds schools have reopened, but it hasnt been easy. New restrictions are evident, and some parents are still choosing to keep their children home. Thats my main worry.South Korea reopened schools, but hundreds recently closed again after a new cluster of cases.