eleventh edition has no biography of Marie Curie, despite her winning of the Nobel Prize in Physics in 1903 and the Nobel Prize in Chemistry in 1911, although she is mentioned briefly under the biography of her husband Pierre Curie. The Britannica employed a large female editorial staff that wrote hundreds of articles for which they were not given credit. Public domain The 1911 edition is no longer restricted by copyright, and it is therefore freely available in several more modern forms. While it may once have been a reliable description of the academic consensus of its time, many modern readers find fault with the Encyclopedia for several major errors, ethnocentric and racist remarks, and other issues: Contemporary opinions of race and ethnicity are included in the Encyclopædias articles. For example, the entry for "Negro" states, "Mentally the negro is inferior to the white... the arrest or even deterioration of mental development [after adolescence] is no doubt very largely after puberty sexual matters take the first place in the negro's life and thoughts." The article about the American Revolutionary War attributes the success of the United States in part to "a population mainly of good English blood and instincts". Many articles are now outdated factually, in particular those concerning science, technology, international and municipal law, and medicine. For example, the article on the vitamin deficiency disease beriberi speculates that it is caused by a fungus, vitamins not having been discovered at the time. Articles about geographic places mention rail connections and ferry stops in towns that no longer employ such transport (though this in itself can be useful for those looking for historical information). Even where the facts might still be accurate, new information, theories and perspectives developed since 1911 have substantially changed the way the same facts might be interpreted. For example, the modern interpretation of the history of the Visigoths is now very different from that of 1911; readers of the eleventh edition who want to know about the social customs and political life of the tribe and its warriors are told to look up the entry for their king, Alaric I. The eleventh edition of Encyclopædia Britannica has become a commonly quoted source, both because of the reputation of the Britannica and because it is now in the public domain and has been made available on the Internet. It has been used as a source by many