Abstract: This paper uses personification to illustrate the recent development and applications of selenium through the story of the “Selenium Knight”. The narrative follows selenium’s journey across various fields, taking on roles as a healer, traveler, and scientist, showcasing its applications in medicine, agriculture, tourism, and industry. Ultimately, as an educator, selenium travels widely to inspire more people to engage in its popularization. Along the way, it establishes the “Selenium Family Science Laboratory”, encouraging students to connect with real-world needs and explore further functions and applications of selenium.

Key words: Selenium, Functions and applications, Popularization of science