This article was published in the daily newspaper Le Monde, Paris, France, December 20, 1949.
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An American magazine, however serious, publishes an article by Mr. Donald Keyhoe, former chief of information for the aeronautical section of the ministry for the American trade, from where it results that "flying saucers" would be sent to earth from another planet. These "interplanetary spacecraft" would be identified today and classified in three principal groups.
However the United States Air Force does not share this point of view and distinguishes three other categories: errors of perception, mild forms of collective hallucination and pure and simple BS.
