EDUARDO BAPTISTA SUN JIAN, a 37-year-old master's degree student in the Chinese city of Yantai, for months staged a solo campaign against his university's COVID-19 prevention measures, including blistering criticism on social media. The last straw for authorities came on March 27, when Sun walked around his campus carrying a placard that read "lift the lockdown on Ludong". Police detained him and on April 1 Ludong University expelled him, according to a letter from the university seen by Reuters. University officials did not respond to a request for comment. The Chinese public have been largely supportive of the zero-COVID policy…