Recently, the paper “Deriving mass-energy equivalence and mass-velocity relation without light”, which was co-accomplished by Teacher Dai Youshan of the School of Information & Electrical Engineering and the researchers of Institute for Advanced Study, Princeton (where Einstein lived), has been published in American Journal of Physics after a rigorous review. Teacher Dai Youshan is a newly retired teacher from the School of Information & Electrical Engineering who has always paid attention to the innovation research of relativity theory with fruitful achievements. His research results have been published in Journal of Peking University, Journal of Zhejiang University, College Physics and other domestic core journals, and have been supported by “Research and Improvement of Relativity Theory (LY17A050001)” of Zhejiang Natural Science Foundation.