Je sais tout
Je sais tout (meaning "I Know All" in English) was a French magazine established by Pierre Lafitte in 1905. It was noted for featuring the works of Maurice Leblanc, in particular the adventures of Arsène Lupin, which was first published in 1905. "Je sais tout" was a popular science magazine. The magazine appeared on the 15th day of each month, but publication was interrupted from August 1914 to the end of 1914. The magazine's format was usually 17.5 cm by 24.5 cm, and contained more than 100 pages. The magazine's logo was created by Jules -Alexandre Grün. Initial circulation figures were estimated to be about 250,000. The headquarters of the magazine was in Paris. "Je sais tout" was published in its original form until 15 January 1922, when it was reformed as "Je sais tout, la revue de la découverte" (meaning "I Know All, Review of Discovery" in English), and was published on the 1st of the month instead. The last issue of the new format, and thus "Je sais tout" overall, was released on 1 September 1939.