Nearly one out of two K-12 students in the United States are at schools that have resumed five-day-a-week in-person classes, according to updated figures from a tracking organization. Up from 46.9 percent a week prior, some 49.1 percent of American primary and secondary students are attending so-called traditional schools, Burbio, the organization, said on Sunday. At the same time, approximately 20.8 percent of students are attending schools that continue only offering virtual classes, down about three percent, while 30 percent attend “hybrid” schools, or schools that offer in-person classes but not five days a week. The peak of students attending virtual-only schools took place on Labor Day 2020, with 62 percent of students having no option of taking physical classes. The figure dropped to just under 37 percent by early November last year before rising to 55 percent in January. Shortly after, another drop started. The 20.8 percent is a …