Magnus Hirschfeld's 1901 pamphlet, What People Should Know about the Third Sex, was a pioneering work aimed at educating the public about gender and sexual diversity. Hirschfeld, a German physician and sexologist, sought to combat prejudice and promote understanding of individuals who did not fit into traditional binary gender categories. The booklet was widely distributed, with 50,000 copies in print by 1911, and was translated into multiple languages, including English, Dutch, and Danish. This work laid the groundwork for modern discussions on gender identity and sexual orientation, making Hirschfeld a key figure in the early LGBTQ+ rights movement.