A controversial computer-based learning model is competing with eight other proposals to be one of the next charter schools approved for the District, the Washington Examiner reports. The proposed Nexus Academy of DC, run by a subsidiary of publishing giant Pearson, would offer grades 9 through 12 in Ward 2, eventually serving up to 600 students. English and math would be taught by teachers at the school, while every other subject — from science and social studies to foreign languages and electives — would be taught online by an expert on various subjects. Some of these experts would be dedicated to the school full time, while others would not…