生化武器研究，精神控制实验，战俘实验……打着“维护国家安全”旗号的德特里克堡生物实验室里究竟还有哪些秘密？戳视频了解。 Over 20 million Chinese have signed an open letter calling on the World Health Organization (WHO) to investigate the U.S. Army Medical Research Institute of Infectious Diseases at Fort Detrick. Published on July 17, the petitioner appealed to the WHO to investigate the lab and urged the U.S. to answer the call from people around the world. So, what is the U.S. Army Medical Research Institute of Infectious Diseases at Fort Detrick? How terrifying is the history of the mystery lab? This video explains. 推荐阅读：美军德特里克堡生物实验室，何时给国际社会一个合理解释？