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An educational film is a film or movie whose primary purpose is to educate. Educational films have been used in classrooms as an alternative to other teaching methods. Determining which videos should count as the first educational films is controversial. Some researchers suggest that the first educational films were shown in St. Petersburg in 1897, while other studies determined that the first educational films were inspired by the newsreel in 1913. Regardless, the increasing number of educational films could prove that the production of such films started in the early 1900s. Educational films are productions aiming to inform target audiences about designated issues. The topic of study varies. Educational cinema was normally divided into three main categories: instructional, educational, and scholastic. Educational films can be used to inform the public about social issues and raise public awareness. For example, an educational film, What About Prejudice?, published in 1959 discussed the prejudice of the white middle class. Land and Space to Grow, released in October 1960, was a story about a typical young American couple who pursue the great adventure of buying land and building a dream home. Challenging questions or debate over social issues are also raised in educational films, such as labor reform, communism, civil rights, and nuclear proliferation. One of these was "An Educational Film on Land Reform," which examined the question "Why is building enough housing for everyone difficult, when everyone agrees it is needed?" The film was shaped into a compelling soft-sell story that allows the audience to reflect on social issues. Educational films can be a powerful aid to teaching, bringing things that students may not be able to experience first-hand into the classroom, and thus improving teaching efficiency. For example, educational films can be used in the teaching of architectural subjects, giving a tour of a structure without needing to bring the students to it physically.