History, broadly understood, intersects with many subject categories. For example, one finds history on the museum sites and in archaeology and anthropology media sites discussed elsewhere in this essay. Another valuable history resource is the digital collections of the Library of Congress (discussed in the gateway section of this essay), which provide a selection of copyright protected and public domain materials chronicling United States history and creative outputs.This site comprises historical primary source videos related to work, entertainment, and historical markers, for example civil rights history and the great earthquake of San Francisco. Most videos are silent movies from the late 1880s to the 1920s. The History Channel (YouTube) offers documentaries on topics throughout the ages. And on Ted Talks: History one can find a wide range of topics, for example a biographical treatment of Rosa Parks and a discussion of how kindness helped some victims survive the Holocaust.