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Li Yongle (Chinese: 李永乐), better known online as 李永乐老师 (lit. Mr. Li Yongle, Teacher Li Yongle) is a Chinese YouTuber. He is known for his educational videos and the popularization of science videos.
Li Yongle was graduated from Tsinghua University as a graduate student in 2009. He became a physical teacher in The High School Affiliated to Renmin University of China later the same year.
In April 2017, one of his videos explaining the term leap year was reposted and became viral.