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In page Michael Moore:

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The title of the film alludes to the classic book Fahrenheit 451 by Ray Bradbury, about a future totalitarian state in which books are banned, and any books found are burned by firemen. According to the novel, paper begins to burn at 451 °F (233 °C). The pre-release subtitle of Moore's film continues the allusion: "The temperature at which freedom burns."[citation needed]