World History Minute: The first massively printed book.

World History Minute: The first massively printed book.
World History Minute: The first massively printed book.

World History Minute: The first massively printed book.

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Historian John Schmidt and Jerome McDonnell talk about the revolutionary date of February 23, 1455, when mass printing began. PHOTO: An original Guttenberg Bible on display at the New York Public Library. (Joe Shlabotnik/Flickr)