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The nation's first free public lending library opened in Massachusetts in 1790 with a collection of books donated by Benjamin Franklin, and public librarians have been helping Americans figure stuff out ever since. Sure, librarians excel at matching the right novel or biography or picture book to the right reader, but their mission is broader, and rooted in a radical idea: Everyone, regardless of age, ethnicity, financial status, or any other factor, has a right to information. In honor of National Library Week, Mental Floss spoke to five public librarians to find out what they do behind the stacks to keep these local repositories of knowledge thriving.